Answers to Even-numbered Exercises

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Answers to Even-numbered Exercises"

Transcription

1 11 Answers to Even-numbered Exercises The special parameter is referenced twice in the out script (page 442). Explain what would be different if the parameter "$* " were used in its place. If you replace with "$*" in the out script, cat or less would be given a single argument: a list of all les you specied on the command line enclosed within single quotation marks. This list works when you specify a single lename. When you specify more than one le, the shell reports No such le or directory because there is not a le named the string you specied on the command line (the SPACEs are not special characters when they are enclosed within single quotation marks) a. Write a function that takes a single lename as an argument and adds execute permission to the le for the user. $ function perms () { chmod u+x $1 b. When might such a function be useful? When you are writing many shell scripts, it can get tedious to give many chmod commands. This function speeds up the process. c. Revise the script so that it takes one or more lenames as arguments and adds execute permission for the user for each le argument. $ function perms { chmod u+x $* 1

2 2 Answers to Even-numbered Exercises d. What can you to make the function available every time you log in? Put the function in the ~/.bash_prole and/or ~/.bashrc le to make it available each time you log in (using bash). e. Suppose that, in addition to having the function available on subsequent login sessions, you want to make the function available now in your current shell. How would you so? Use source to execute the le you put the function in, for example, $ source ~/.bash_prole Write a shell script that displays the names of all directory les, but no other types of les, in the working directory. There are many ways to solve this problem. The listdirs script uses le to identify directory les and grep to pull them out of the list. Then sed removes everything from le s output, starting with the colon. $ cat listdirs le grep directory sed 's/:.*//' Enter the following script named saveles, and give yourself execute permission to the le: $ cat saveles #! /bin/bash echo "Saving les in current directory in le savethem." exec savethem for i in * echo "===================================================" echo "File: $i" echo "===================================================" cat "$i" ne a. What error message you get when you execute this script? Rewrite the script so that the error es not occur, making sure the output still goes to savethem. You get the following error message: cat: savethem: input le is output le Add the following lines after the line with on it: if [ $i == "savethem" ] ; continue

3 Answers to Even-numbered Exercises 3 b. What might be a problem with running this script twice in the same directory? Discuss a solution to this problem. Each time you run saveles, it overwrites the savethem le with the current contents of the working directory. When you remove a le and run saveles again, that le will no longer be in savethem. If you want to keep an archive of les in the working directory, you need to save the les to a new le each time you run saveles. If you prex the lename savethem with $$, you will have a unique lename each time you run saveles Using the nd utility, perform the following tasks: a. List all les in the working directory and all subdirectories that have been modied within the last day. $ nd. -mtime -1 b. List all les that you have read access to on the system that are larger than 1 megabyte. $ nd / -size +1024k c. Remove all les named core from the directory structure rooted at your home directory. $ nd ~ -name core -exec rm {} \; d. List the inode numbers of all les in the working directory whose lenames end in.c. $ nd. -name "*.c" -ls e. List all les that you have read access to on the root lesystem that have been modied in the last 30 days. $ nd / -xdev -mtime Write a script that takes the name of a directory as an argument and searches the le hierarchy rooted at that directory for zero-length les. Write the names of all zero-length les to standard output. If there is no option on the command line, have the script delete the le after displaying its name, asking the user for conrmation, and receiving positive conrmation. A f (force) option on the command line indicates that the script should display the lename but not ask for conrmation before deleting the le. The following script segment deletes only ordinary les, not directories. As always, you must specify a shell and check arguments.

4 4 Answers to Even-numbered Exercises $ cat zerdel if [ "$1" == "-f" ] nd $2 -empty -print -exec rm -f {} \; else nd $1 -empty -ok rm -f {} \; Generalize the script written in exercise 13 so that the character separating the list items is given as an argument to the function. If this argument is absent, the separator should default to a colon. This script segment takes an optional option in the form dx to specify the delimiter x: $ cat nodel if [[ $1 == -d? ]] del=$(echo $1 cut -b3) shift else del=: IFS=$del set $* for i echo $i ne Rewrite bundle (page 469) so that the script it creates takes an optional list of lenames as arguments. If one or more lenames are given on the command line, only those les should be re-created; otherwise, all les in the shell archive should be re-created. For example, suppose that all les with the lename extension.c are bundled into an archive named srcshell, and you want to unbundle just the les test1.c and test2.c. The following command will unbundle just these two les: $ bash srcshell test1.c test2.c $ cat bundle2 #!/bin/bash # bundle: group les into distribution package echo "# To unbundle, bash this le" for i echo 'if echo $* grep -q' $i ' [ $# = 0 ]' echo echo "echo $i 1&2" echo "cat $i <<'End of $i'" cat $i echo "End of $i" echo ne

5 Answers to Even-numbered Exercises In principle, recursion is never necessary. It can always be replaced by an iterative construct, such as while or until. Rewrite makepath (page 511) as a nonrecursive function. Which version you prefer? Why? function makepath2() { wd=$(pwd) pathname=$1 while [[ $pathname = */* && ${#pathname} 0 ]] if [[! -d "${pathname%%/*}" ]] mkdir "${pathname%%/*}" cd "${pathname%%/*}" pathname="${pathname#*/}" ne if [[! -d $pathname && ${#pathname} 0 ]] mkdir $pathname cd $wd } The recursive version is simpler: There is no need to keep track of the working directory and you not have to handle making the nal directory separately Write a function that takes a directory name as an argument and writes to standard output the maximum of the lengths of all lenames in that directory. If the function s argument is not a directory name, write an error message to standard output and exit with nonzero status. $ function maxfn () { typeset -i max thisone if [! -d "$1" -o $# = 0 ] echo "Usage: maxfn dirname" return 1 max=0 for fn in $(/bin/ls $1) thisone=${#fn} if [ $thisone -gt $max ] max=$thisone ne echo "Longest lename is $max characters." 21.

6 6 Answers to Even-numbered Exercises 22. Write a function that lists the number of regular les, directories, block special les, character special les, FIFOs, and symbolic links in the working directory. Do this in two different ways: a. Use the rst letter of the output of ls l to determine a le s type. $ function ft () { typeset -i reg=0 dir=0 blk=0 char=0 fo=0 symlnk=0 other=0 for fn in * case $(ls -ld "$fn" cut -b1) in d) ((dir=$dir+1)) b) ((blk=$blk+1)) c) ((char=$char+1)) p) ((fo=$fo+1)) l) ((symlnk=$symlnk+1)) a-z) ((other=other+1)) *) ((reg=reg+1)) esac ne echo $reg regular echo $dir directory echo $blk block echo $char character echo $fo FIFO echo $symlnk symbolic link echo $other other

7 Answers to Even-numbered Exercises 7 b. Use the le type condition tests of the [[ expression ]] syntax to determine a le s type. $ function ft2 () { typeset -i reg=0 dir=0 blk=0 char=0 fo=0 symlnk=0 other=0 for fn in * if [[ -h $fn ]] ((symlnk=$symlnk+1)) elif [[ -f $fn ]] ((reg=reg+1)) elif [[ -d $fn ]] ((dir=$dir+1)) elif [[ -b $fn ]] ((blk=$blk+1)) elif [[ -c $fn ]] ((char=$char+1)) elif [[ -p $fn ]] ((fo=$fo+1)) else ((other=other+1)) ne echo $reg regular echo $dir directory echo $blk block echo $char character echo $fo FIFO echo $symlnk symbolic link echo $other other 23.

Answers to Even-Numbered Exercises

Answers to Even-Numbered Exercises 28 Answers to Even-Numbered Exercises 1. Rewrite the journal script of Chapter 9 (question 5, page 340) by adding commands to verify that the user has write permission for a le named journal-le in the

More information

Shell Scripting Crash Course

Shell Scripting Crash Course Shell Scripting Crash Course Travis Phillips JAX LUG Overview What is a shell script What can I do with a shell script How to build shell scripts Syntax basics Basic useful shell commands Pipes and redirectors

More information

BASH Scripting. A bash script may consist of nothing but a series of command lines, e.g. The following helloworld.sh script simply does an echo.

BASH Scripting. A bash script may consist of nothing but a series of command lines, e.g. The following helloworld.sh script simply does an echo. BASH Scripting bash is great for simple scripts that automate things you would otherwise by typing on the command line. Your command line skills will carry over to bash scripting and vice versa. bash comments

More information

Bash shell programming Part II Control statements

Bash shell programming Part II Control statements Bash shell programming Part II Control statements Deniz Savas and Michael Griffiths 2005-2011 Corporate Information and Computing Services The University of Sheffield Email M.Griffiths@sheffield.ac.uk

More information

Thirty Useful Unix Commands

Thirty Useful Unix Commands Leaflet U5 Thirty Useful Unix Commands Last revised April 1997 This leaflet contains basic information on thirty of the most frequently used Unix Commands. It is intended for Unix beginners who need a

More information

Shell Programming. ls -lt /usr/share/man/man1/$1.1. troff -man /usr/share/man/man1/$1.1 > t2 echo..done troff. ls -lt /usr/share/man/man1/$1.

Shell Programming. ls -lt /usr/share/man/man1/$1.1. troff -man /usr/share/man/man1/$1.1 > t2 echo..done troff. ls -lt /usr/share/man/man1/$1. Shell Programming Examples of simple shell scripts: man2pdf : converts a man page to pdf ls -lt /usr/share/man/man1/$1.1 troff -man /usr/share/man/man1/$1.1 > t2 echo..done troff cat t2 dpost > t3 echo..done

More information

What is Shell Script?

What is Shell Script? Linux Shell Scripts What is Shell Script? We have seen some basic shell commands, it s time to move on to scripts. There are two ways of writing shell programs. You can type a sequence of commands and

More information

Unix Sampler. PEOPLE whoami id who

Unix Sampler. PEOPLE whoami id who Unix Sampler PEOPLE whoami id who finger username hostname grep pattern /etc/passwd Learn about yourself. See who is logged on Find out about the person who has an account called username on this host

More information

Lecture 4: Writing shell scripts

Lecture 4: Writing shell scripts Handout 5 06/03/03 1 Your rst shell script Lecture 4: Writing shell scripts Shell scripts are nothing other than les that contain shell commands that are run when you type the le at the command line. That

More information

Introduction to Shell Programming

Introduction to Shell Programming Introduction to Shell Programming Timothy Brown February 12, 2015 Specifically bash Research Computing @ CU Boulder Introduction to Shell Programming 1 February 12, 2015 Overview Introduction Variables

More information

USEFUL UNIX COMMANDS

USEFUL UNIX COMMANDS cancel cat file USEFUL UNIX COMMANDS cancel print requested with lp Display the file cat file1 file2 > files Combine file1 and file2 into files cat file1 >> file2 chgrp [options] newgroup files Append

More information

Internet Traffic Measurements. Shell Scripts. School of Electrical Engineering AALTO UNIVERSITY

Internet Traffic Measurements. Shell Scripts. School of Electrical Engineering AALTO UNIVERSITY Internet Traffic Measurements Shell Scripts School of Electrical Engineering AALTO UNIVERSITY Page 1 Contents What is a shell script?... 2 Useful Linux commands... 2 Useful commands for data manipulation...

More information

KORN SHELL PROGRAMMING CHEAT SHEET

KORN SHELL PROGRAMMING CHEAT SHEET KORN SHELL PROGRAMMING CHEAT SHEET Special Characters Metacharacters have special meaning to the shell unless quoted (by preceding it with a \ or enclosing it in ` `) Inside double quotes parameter and

More information

The Command Line. Matthew Bender. Friday 9 th October, CMSC Command Line Workshop

The Command Line. Matthew Bender. Friday 9 th October, CMSC Command Line Workshop The Command Line Matthew Bender CMSC Command Line Workshop Friday 9 th October, 2015 Matthew Bender (2015) The Command Line Friday 9 th October, 2015 1 / 22 Functions Section 1 Functions Matthew Bender

More information

LINUX SHELL SCRIPTING Sagar MungsE------

LINUX SHELL SCRIPTING Sagar MungsE------ LINUX SHELL SCRIPTING ------Sagar MungsE------ Shell Scripting Text files that contain sequences of UNIX commands, created by a text editor No compiler required to run a shell script, because the UNIX

More information

CS2043 - Unix Tools & Scripting Lecture 9 Shell Scripting

CS2043 - Unix Tools & Scripting Lecture 9 Shell Scripting CS2043 - Unix Tools & Scripting Lecture 9 Shell Scripting Spring 2015 1 February 9, 2015 1 based on slides by Hussam Abu-Libdeh, Bruno Abrahao and David Slater over the years Announcements Coursework adjustments

More information

Ashell program combines Linux commands in such a way as to perform a specific

Ashell program combines Linux commands in such a way as to perform a specific Shell Programming 1 2 Red Hat Linux: The Complete Reference Ashell program combines Linux commands in such a way as to perform a specific task. The Linux shell provides you with many programming tools

More information

Automating tasks through scripting. HPC Certificate Program

Automating tasks through scripting. HPC Certificate Program Automating tasks through scripting HPC Certificate Program Summary of preparation lectures From "The Shell" at Software Carpentry: Lecture 4: Pipes and Filters The redirect operator saves command output

More information

Creating Groups in Linux

Creating Groups in Linux Creating Groups in Linux Estimated Time: 30 minutes Objective Equipment Scenario Procedures In this lab, the student will learn how to create, rename, and delete groups using the Linux operating system.

More information

Linux Commands. Dr. Hyrum D. Carroll. August 25, 2016

Linux Commands. Dr. Hyrum D. Carroll. August 25, 2016 Linux Commands Dr. Hyrum D. Carroll August 25, 2016 Quiz Linux Commands Linux Commands I (review) man ls cd touch cp mv rm mkdir rmdir Linux Commands I (review) man - show manual for a command, example:

More information

Introduction to Shell Scripting

Introduction to Shell Scripting Introduction to Shell Scripting Lecture 1. Shell scripts are small programs. They let you automate multi-step processes, and give you the capability to use decision-making logic and repetitive loops. 2.

More information

Computer Science 340. Operating Systems. Assignment 1 SOME SHELL SCRIPT EXAMPLES

Computer Science 340. Operating Systems. Assignment 1 SOME SHELL SCRIPT EXAMPLES Computer Science 340 Operating Systems Assignment 1 SOME SHELL SCRIPT EXAMPLES NOTICE that all the files I use in these examples have names which begin with the letters ss. If your files have names which

More information

Laboratory Manual. For OPERATING SYSTEM (140702) B.E. (COMPUTER) SEM IV. January 2013

Laboratory Manual. For OPERATING SYSTEM (140702) B.E. (COMPUTER) SEM IV. January 2013 Laboratory Manual For OPERATING SYSTEM (140702) B.E. (COMPUTER) SEM IV January 2013 Shree Swami Atmanand Saraswati Institute of Technology Shree Swami Atmanand Vidya Sankul, Kapodra, Varachha Road, Surat

More information

Hadoop Hands-On Exercises

Hadoop Hands-On Exercises Hadoop Hands-On Exercises Lawrence Berkeley National Lab Oct 2011 We will Training accounts/user Agreement forms Test access to carver HDFS commands Monitoring Run the word count example Simple streaming

More information

Unix Shell Scripts. Contents. 1 Introduction. Norman Matloff. July 30, 2008. 1 Introduction 1. 2 Invoking Shell Scripts 2

Unix Shell Scripts. Contents. 1 Introduction. Norman Matloff. July 30, 2008. 1 Introduction 1. 2 Invoking Shell Scripts 2 Unix Shell Scripts Norman Matloff July 30, 2008 Contents 1 Introduction 1 2 Invoking Shell Scripts 2 2.1 Direct Interpretation....................................... 2 2.2 Indirect Interpretation......................................

More information

Using SVN to Manage Source RTL

Using SVN to Manage Source RTL Using SVN to Manage Source RTL CS250 Tutorial 1 (Version 083010a) August 30, 2010 Yunsup Lee In this tutorial you will gain experience using the Subversion (SVN) to manage your source RTL and code. You

More information

Unix. File system and Command-Interpreter (shell)

Unix. File system and Command-Interpreter (shell) Unix. File system and Command-Interpreter (shell) Concepts Absolute and relative filenames, path, file permissions, owner, links, device independence, redirection, pipes, filters. Description The Unix

More information

Unix tutorial. Introduction to Unix. VI, March Page 1

Unix tutorial. Introduction to Unix.  VI, March Page 1 Unix tutorial Introduction to Unix http://linux.oreilly.com/ Page 1 Unix tutorial Outline Basic background in Unix structure Directories and files I (listing, navigation, filenames) Directories and files

More information

Using Linux Six rules of thumb in using Linux EVERYTHING ls -l ls /bin ctrl-d Linux Kernel Shell Command Interpretation shell myfile myfile

Using Linux Six rules of thumb in using Linux EVERYTHING ls -l ls /bin ctrl-d Linux Kernel Shell Command Interpretation shell myfile myfile Using Linux In this section we cover some background Linux concepts including some general rules of thumb when using Linux, the operating system kernel, the shell command interpreter, and the file system.

More information

An Introduction to the Linux Command Shell For Beginners

An Introduction to the Linux Command Shell For Beginners An Introduction to the Linux Command Shell For Beginners Presented by: Victor Gedris In Co-Operation With: The Ottawa Canada Linux Users Group and ExitCertified Copyright and Redistribution This manual

More information

CPSC2800: Linux Hands-on Lab #3 Explore Linux file system and file security. Project 3-1

CPSC2800: Linux Hands-on Lab #3 Explore Linux file system and file security. Project 3-1 CPSC2800: Linux Hands-on Lab #3 Explore Linux file system and file security Project 3-1 Linux support many different file systems that can be mounted using the mount command. In this project, you use the

More information

Chapter 8: Shell Scripting. Chapter 8 Shell Scripting

Chapter 8: Shell Scripting. Chapter 8 Shell Scripting Chapter 8: Shell Scripting Chapter 8 Shell Scripting Last revised: 20/6/2004 Chapter 8 Outline In this chapter we will learn how to: Create shell scripts Use variables and environment variables Pass parameters

More information

Shell Scripts (1) For example: #!/bin/sh If they do not, the user's current shell will be used. Any Unix command can go in a shell script

Shell Scripts (1) For example: #!/bin/sh If they do not, the user's current shell will be used. Any Unix command can go in a shell script Shell Programming Shell Scripts (1) Basically, a shell script is a text file with Unix commands in it. Shell scripts usually begin with a #! and a shell name For example: #!/bin/sh If they do not, the

More information

SFTP SHELL SCRIPT USER GUIDE

SFTP SHELL SCRIPT USER GUIDE SFTP SHELL SCRIPT USER GUIDE FCA US INFORMATION & COMMUNICATION TECHNOLOGY MANAGEMENT Overview The EBMX SFTP shell scripts provide a parameter driven workflow to place les on the EBMX servers and queue

More information

CS 2112 Lab: Version Control

CS 2112 Lab: Version Control 29 September 1 October, 2014 Version Control What is Version Control? You re emailing your project back and forth with your partner. An hour before the deadline, you and your partner both find different

More information

UNIX Commands. COMP 444/5201 Revision 1.4 January 25,

UNIX Commands. COMP 444/5201 Revision 1.4 January 25, UNIX Commands COMP 444/5201 Revision 1.4 January 25, 2005 1 Contents Shell Intro Command Format Shell I/O Command I/O Command Overview 2 Shell Intro A system program that allows a user to execute: shell

More information

CS2720 Practical Software Development

CS2720 Practical Software Development Page 1 Rex Forsyth CS2720 Practical Software Development CS2720 Practical Software Development Scripting Tutorial Srping 2011 Instructor: Rex Forsyth Office: C-558 E-mail: forsyth@cs.uleth.ca Tel: 329-2496

More information

Systems Programming & Scripting

Systems Programming & Scripting Systems Programming & Scripting Lecture 14 - Shell Scripting: Control Structures, Functions Syst Prog & Scripting - Heriot Watt University 1 Control Structures Shell scripting supports creating more complex

More information

An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories

An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories Mac OS by bertram lyons senior consultant avpreserve AVPreserve Media Archiving & Data Management Consultants

More information

Module Eight Shell Scripting in Linux

Module Eight Shell Scripting in Linux Postgraduate course, Covenant University Ota, Nigeria Oyelade, O. J., PhD ola.oyelade@covenantuniversity.edu.ng Isewon, I. itunu.isewon@covenantuniversity.edu.ng Module Eight Shell Scripting in Linux 8.1

More information

Unix Scripts and Job Scheduling

Unix Scripts and Job Scheduling Unix Scripts and Job Scheduling Michael B. Spring Department of Information Science and Telecommunications University of Pittsburgh spring@imap.pitt.edu http://www.sis.pitt.edu/~spring Overview Shell Scripts

More information

Shell Scripting. 2014/10/09 Victor Eijkhout

Shell Scripting. 2014/10/09 Victor Eijkhout Shell Scripting 2014/10/09 Victor Eijkhout What is a shell? Command interpreter: listens for your commands, executes, shows output Toolbox: chain together commands with pipes Programming language: Variables

More information

Lab Manual. Unix and Linux Programming (Pr) COT-218 and IT-214

Lab Manual. Unix and Linux Programming (Pr) COT-218 and IT-214 Lab Manual Unix and Linux Programming (Pr) COT-218 and IT-214 Lab Instructions Several practicals / programs? Whether an experiment contains one or several practicals /programs One practical / program

More information

HP-UX Essentials and Shell Programming Course Summary

HP-UX Essentials and Shell Programming Course Summary Contact Us: (616) 875-4060 HP-UX Essentials and Shell Programming Course Summary Length: 5 Days Prerequisite: Basic computer skills Recommendation Statement: Student should be able to use a computer monitor,

More information

Shell Scripts in UNIX

Shell Scripts in UNIX Shell Scripts in UNIX Prof. P.C.P. Bhatt P.C.P Bhatt OS/M13/V1/2004 1 Unix System Shell Organization In the below figure we show how a user interacts with UNIX shell. P.C.P Bhatt OS/M13/V1/2004 2 Facilities

More information

Linux command line. An introduction to the Linux command line for genomics. Susan Fairley

Linux command line. An introduction to the Linux command line for genomics. Susan Fairley Linux command line An introduction to the Linux command line for genomics Susan Fairley Aims Introduce the command line Provide an awareness of basic functionality Illustrate with some examples Provide

More information

LECTURE-7. Introduction to DOS. Introduction to UNIX/LINUX OS. Introduction to Windows. Topics:

LECTURE-7. Introduction to DOS. Introduction to UNIX/LINUX OS. Introduction to Windows. Topics: Topics: LECTURE-7 Introduction to DOS. Introduction to UNIX/LINUX OS. Introduction to Windows. BASIC INTRODUCTION TO DOS OPERATING SYSTEM DISK OPERATING SYSTEM (DOS) In the 1980s or early 1990s, the operating

More information

This is Lab Worksheet 4 - not an Assignment

This is Lab Worksheet 4 - not an Assignment This is Lab Worksheet 4 - not an Assignment This Lab Worksheet contains some practical examples that will prepare you to complete your Assignments. You do not have to hand in this Lab Worksheet. Make sure

More information

Linux Constructs. The default separator character between each integer is a newline, but this can be changed with the -s option.

Linux Constructs. The default separator character between each integer is a newline, but this can be changed with the -s option. Linux Constructs Relational Operators -eq - Equal to -lt - Less than -gt - Greater than -ge - Greater than or Equal to -le - Less than or Equal to File related tests -f le - True if le exists and is a

More information

Answers to Even- Numbered Exercises

Answers to Even- Numbered Exercises Answers to Even- 12 Numbered Exercises from page 620 1. The following shell script adds entries to a file named journal-file in your home directory. The script can help you keep track of phone conversations

More information

WELCOME to UNIX/Linux II Shell Scripting OUTLINE 1. Parameters 2. Variables 3. Some commands 4. Control structures 5. getopts

WELCOME to UNIX/Linux II Shell Scripting OUTLINE 1. Parameters 2. Variables 3. Some commands 4. Control structures 5. getopts UNIX Operating Systems II Part 2: Shell Scripting Instructor: Stan Isaacs Shell Scripts Parameters/arguments - what s on the input line Control structures for - repetition if then else - conditional execution

More information

CompTIA Linux + Certification Week 9 Projects

CompTIA Linux + Certification Week 9 Projects CompTIA Linux + Certification Week 9 Projects Project 9-1 In this hands- on project, you view characteristics of processes using the ps command. 1. Turn on your computer. After your Linux system has loaded,

More information

SCR. Scripting. Goals of this lab: Prerequisites: LXB

SCR. Scripting. Goals of this lab: Prerequisites: LXB SCR Scripting Goals of this lab: To learn the basics of writing shell scripts. To gain insight in the gains with automating administrative work. To gain practical experience of automating administrative

More information

CS10110: Scripting in Bash

CS10110: Scripting in Bash Scripting in Bash (Bourne-again shell) CS10110: Scripting in Bash Laurence Tyler lgt@aber.ac.uk October 2012 Using many commands together Similar to batch les in DOS / Winws, but rather more sophisticated

More information

Linux Shells. Linux Shells. Book Chapter 5. What is a shell? Examples: Linux default shell /bin/bash. How do I know what shell I am running?

Linux Shells. Linux Shells. Book Chapter 5. What is a shell? Examples: Linux default shell /bin/bash. How do I know what shell I am running? Linux Shells Book Chapter 5 What is a shell? Examples: bash Bourne Again shell ksh tcsh Korn shell C shell 1 Linux Shells Linux default shell /bin/bash How do I know what shell I am running? echo $SHELL

More information

Hands-On UNIX Exercise:

Hands-On UNIX Exercise: Hands-On UNIX Exercise: This exercise takes you around some of the features of the shell. Even if you don't need to use them all straight away, it's very useful to be aware of them and to know how to deal

More information

Using SVN to Manage Source RTL

Using SVN to Manage Source RTL Using SVN to Manage Source RTL CS250 Tutorial 1 (Version 092509a) September 25, 2009 Yunsup Lee In this tutorial you will gain experience using the Subversion (SVN) to manage your source RTL and code.

More information

Extreme computing lab exercises Session one

Extreme computing lab exercises Session one Extreme computing lab exercises Session one Miles Osborne (original: Sasa Petrovic) October 23, 2012 1 Getting started First you need to access the machine where you will be doing all the work. Do this

More information

Introduction to shell scripting

Introduction to shell scripting Introduction to shell scripting Thomas Röblitz thomas.roblitz@usit.uio.no Research Infrastructure Services Group Department for Research Computing (DRC) DRC Course Week, April 16-18, 2013 Outline What

More information

Automating Tasks Using bash

Automating Tasks Using bash Overview Automating Tasks Using bash David McCaughan, HPC Analyst SHARCNET, University of Guelph dbm@sharcnet.ca Introduction to command shells & bash bash fundamentals I/O redirection, pipelining, wildcard

More information

Introduction to the UNIX Operating System and Open Windows Desktop Environment

Introduction to the UNIX Operating System and Open Windows Desktop Environment Introduction to the UNIX Operating System and Open Windows Desktop Environment Welcome to the Unix world! And welcome to the Unity300. As you may have already noticed, there are three Sun Microsystems

More information

Shell Scripts. Jacob Morzinski Jan-23 1

Shell Scripts. Jacob Morzinski Jan-23 1 Shell Scripts Jacob Morzinski jmorzins@mit.edu http://sipb.mit.edu/iap/2006/shell/ http://web.mit.edu/sipb-iap/www/2006/shell/ 2006-Jan-23 1 Why use shell scripts? They simplify your life. Store complicated

More information

LING 408/508: Programming for Linguists. Lecture 4 September 2 nd

LING 408/508: Programming for Linguists. Lecture 4 September 2 nd LING 408/508: Programming for Linguists Lecture 4 September 2 nd Administrivia Did people manage to install Ubuntu as a guest OS inside VirtualBox? (We'll try to reserve a bit of 0me at the end.) Today

More information

Command Line - Part 1

Command Line - Part 1 Command Line - Part 1 STAT 133 Gaston Sanchez Department of Statistics, UC Berkeley gastonsanchez.com github.com/gastonstat Course web: gastonsanchez.com/teaching/stat133 GUIs 2 Graphical User Interfaces

More information

Introduction to Unix. Unix tutorial. Unix tutorial. Outline. Basic background in Unix structure

Introduction to Unix. Unix tutorial. Unix tutorial. Outline.  Basic background in Unix structure Unix tutorial Introduction to Unix http://linux.oreilly.com/ Page 1 Unix tutorial Outline Basic background in Unix structure Directories and files I (listing, navigation, filenames) Directories and files

More information

Environment Variables. Command Line. Environment Variables. Variables. csh/tcsh:

Environment Variables. Command Line. Environment Variables. Variables. csh/tcsh: Overview Shell Scripting Tom Logan (Slides from Kate Hedstrom & Don Bahls) Variables Scripting Basics Bash Shell Scripts Other Scripting Advanced Command Line Appendix (C-Shell Scripts) Shells Bash There

More information

Setting Up the Site Licenses

Setting Up the Site Licenses XC LICENSE SERVER Setting Up the Site Licenses INTRODUCTION To complete the installation of an XC Site License, create an options file that includes the Host Name (computer s name) of each client machine.

More information

Advance Bash Shell Scripting

Advance Bash Shell Scripting Advance Bash Shell Scripting 1- Introduction to Shell What is shell Installation of shell Shell features Bash Keywords Built-in Commands Linux Commands Specialized Navigation and History Commands Shell

More information

Hadoop Hands-On Exercises

Hadoop Hands-On Exercises Hadoop Hands-On Exercises Lawrence Berkeley National Lab July 2011 We will Training accounts/user Agreement forms Test access to carver HDFS commands Monitoring Run the word count example Simple streaming

More information

Syntax: cd <Path> Or cd $<Custom/Standard Top Name>_TOP (In CAPS)

Syntax: cd <Path> Or cd $<Custom/Standard Top Name>_TOP (In CAPS) List of Useful Commands for UNIX SHELL Scripting We all are well aware of Unix Commands but still would like to walk you through some of the commands that we generally come across in our day to day task.

More information

BASH Shell Scripting. Adapted from:

BASH Shell Scripting. Adapted from: BASH Shell Scripting Adapted from: http://www.eecs.wsu.edu/~cs302/notes/shprogramming.html http://steve-parker.org/sh The basics A shell script is a collection of Unix commands, with a little bit of programming

More information

Introduction to Linux Basics

Introduction to Linux Basics Introduction to Linux Basics Part-II Shell Scripting Georgia Advanced Computing Resource Center University of Georgia Zhuofei Hou, HPC Trainer zhuofei@uga.edu Outline What is GACRC? What are Linux Shell

More information

Kleine Linux-Tricks - schneller ohne Aufwand

Kleine Linux-Tricks - schneller ohne Aufwand Uli Martens uli@youam.net AIXpertenrunde 2008-12-12 Übersicht 1 2 3 4 hotkeys ALT-T exchange two arguments under the cursor (bash only) CTRL-T exchange two characters under the cursor (bash only) CTRL-L

More information

grep, awk and sed three VERY useful command-line utilities Matt Probert, Uni of York grep = global regular expression print

grep, awk and sed three VERY useful command-line utilities Matt Probert, Uni of York grep = global regular expression print grep, awk and sed three VERY useful command-line utilities Matt Probert, Uni of York grep = global regular expression print In the simplest terms, grep (global regular expression print) will search input

More information

Linux commands 12 th Sept. 07 By Fabian

Linux commands 12 th Sept. 07 By Fabian Advanced Systems and Network Course @ UCC Linux commands 12 th Sept. 07 By Fabian 1 Overview UNIX Linux Simple Linux commands Linux text editors 2 UNIX UNIX is an operating system, originally written at

More information

Lab 1: Introduction to C, ASCII ART and the Linux Command Line Environment

Lab 1: Introduction to C, ASCII ART and the Linux Command Line Environment .i.-' `-. i..' `/ \' _`.,-../ o o \.' ` ( / \ ) \\\ (_.'.'"`.`._) /// \\`._(..: :..)_.'// \`. \.:-:. /.'/ `-i-->..

More information

AWS running first C++ program

AWS running first C++ program AWS running first C++ program This document describes how edit, compile, link, and run your first linux program using: - Terminal a command line interface to your linux os - Emacs a popular ide for linux

More information

Answers to Even- Numbered Exercises

Answers to Even- Numbered Exercises Answers to Even- 5 Numbered Exercises from page 163 1. What does the shell ordinarily do while a command is executing? What should you do if you do not want to wait for a command to finish before running

More information

A Crash Course on UNIX

A Crash Course on UNIX A Crash Course on UNIX UNIX is an "operating system". Interface between user and data stored on computer. A Windows-style interface is not required. Many flavors of UNIX (and windows interfaces). Solaris,

More information

Using Parallel Computing to Run Multiple Jobs

Using Parallel Computing to Run Multiple Jobs Beowulf Training Using Parallel Computing to Run Multiple Jobs Jeff Linderoth August 5, 2003 August 5, 2003 Beowulf Training Running Multiple Jobs Slide 1 Outline Introduction to Scheduling Software The

More information

1. The UNIX Architecture

1. The UNIX Architecture Chapter 2. The UNIX Architecture and Command Usage Introduction In order to understand the subsequent chapters, we first need to understand the architecture of UNIX and the concept of division of labor

More information

CS197U: A Hands on Introduction to Unix

CS197U: A Hands on Introduction to Unix CS197U: A Hands on Introduction to Unix Lecture 5: Programming & Scripting J.D. DeVaughn-Brown University of Massachusetts Amherst Department of Computer Science jddevaughn@cs.umass.edu 1 Reminders Assignment

More information

Automating admin tasks using shell scripts and cron Vijay Kumar Adhikari. vijay@kcm

Automating admin tasks using shell scripts and cron Vijay Kumar Adhikari. vijay@kcm Automating admin tasks using shell scripts and cron Vijay Kumar Adhikari vijay@kcm kcm.edu.np How do we go? Introduction to shell scripts Example scripts Introduce concepts at we encounter them in examples

More information

Steve Crouch, Mike Jackson, The Software Sustainability Institute. Steve McGough, Newcastle University.

Steve Crouch, Mike Jackson, The Software Sustainability Institute. Steve McGough, Newcastle University. Bash Shell Key Points ===================== Steve Crouch, Mike Jackson, The Software Sustainability Institute. Steve McGough, Newcastle University. This work is licensed under the Creative Commons Attribution

More information

Question Bank 10CS44: UNIX & SHELL PROGRAMMING

Question Bank 10CS44: UNIX & SHELL PROGRAMMING Question Bank 10CS44: UNIX & SHELL PROGRAMMING CHAPTER 1 : UNIX OS AND SOME BASIC COMMANDS,FILE SYSTEM OBJECTIVE: UNIX Born in the dark and somber portals of Bell Labs, it was a dream that one man nurtured

More information

CSIL MiniCourses. Introduction To Unix (I) John Lekberg Sean Hogan Cannon Matthews Graham Smith. Updated on: 2015-10-14

CSIL MiniCourses. Introduction To Unix (I) John Lekberg Sean Hogan Cannon Matthews Graham Smith. Updated on: 2015-10-14 CSIL MiniCourses Introduction To Unix (I) John Lekberg Sean Hogan Cannon Matthews Graham Smith Updated on: 2015-10-14 What s a Unix? 2 Now what? 2 Your Home Directory and Other Things 2 Making a New Directory

More information

Chapter 3 Introduction to Shells and Scripting

Chapter 3 Introduction to Shells and Scripting Chapter 3 Introduction to Shells and Scripting 3.1 What is a Shell? For our purposes, a shell will be considered as a command line interface that allows the user to input commands. These commands can range

More information

Unix/Linux basics Operating systems lab Gergely Windisch room 4.12

Unix/Linux basics Operating systems lab Gergely Windisch room 4.12 Unix/Linux basics 0001 Operating systems lab Gergely Windisch windisch.gergely@nik.bmf.hu room 4.12 http://nik.bmf.hu/gwindisch/os_2010 And now: the test Assignment test 20 minutes Grade together Is of

More information

Session 2: Shell Scripting

Session 2: Shell Scripting Session 2: Shell Scripting Craig A. Struble, Ph.D. July 14, 2010 1 Introduction Shell scripts are a way to automate the execution of a series of Linux commands. Essentially, any command you can run from

More information

CHAPTER 5 THE KORN SHELL

CHAPTER 5 THE KORN SHELL CHAPTER 5 THE KORN SHELL ALIASES The Korn shell allows you to create and customize your ow ommands by using the alias command. alias [word [=string]] alias dir= ls F # option-f appends / for files, * for

More information

Which shell? Shells. Common shell facilities. bash versus sh

Which shell? Shells. Common shell facilities. bash versus sh Shells A shell is a command line interpreter that is the interface between the user and the OS. The shell: analyzes each command determines what actions are to be performed performs the actions Example:

More information

Filtering Tools. Filtering Tools and a Bit More About I/O Redirection

Filtering Tools. Filtering Tools and a Bit More About I/O Redirection Filtering Tools Filtering Tools and a Bit More About I/O Redirection Copyright 2006 2009 Stewart Weiss Input redirection operator < The input redirection operator '

More information

Introduction to Linux Scripting. Albert Lund CHPC User Services

Introduction to Linux Scripting. Albert Lund CHPC User Services Introduction to Linux Scripting Albert Lund CHPC User Services Overview What is scripting? Compiling mini-excercise Basic bash/tcsh scripting exercises Slides: home.chpc.utah.edu/~u0403692/introscripting.pdf

More information

Linux Lecture-2. Ashish Bhatia Summer 2009

Linux Lecture-2. Ashish Bhatia Summer 2009 Linux Lecture-2 Ashish Bhatia Summer 2009 Doubts (from previous lecture)? Concept of Users GNU/Linux is a multi-user OS Everything is a file or a process Each process must specify which user is the owner

More information

Unix Shell Scripting Tutorial Ashley J.S Mills

Unix Shell Scripting Tutorial Ashley J.S Mills Ashley J.S Mills Copyright 2005 The University Of Birmingham Table of Contents 1.Introduction... 1 2.Environment... 1 3. Shell Scripting... 1 3.1. Shell Scripting Introduction...

More information

Advanced Bash Scripting. Joshua Malone (jmalone@ubergeeks.com)

Advanced Bash Scripting. Joshua Malone (jmalone@ubergeeks.com) Advanced Bash Scripting Joshua Malone (jmalone@ubergeeks.com) Why script in bash? You re probably already using it Great at managing external programs Powerful scripting language Portable and version-stable

More information

UNIX - USEFUL COMMANDS

UNIX - USEFUL COMMANDS UNIX - USEFUL COMMANDS http://www.tutorialspoint.com/unix/unix-useful-commands.htm Copyright tutorialspoint.com This quick guide lists commands, including a syntax and brief description. For more detail,

More information

An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories

An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories An Introduction to Using the Command Line Interface (CLI) to Work with Files and Directories Windows by bertram lyons senior consultant avpreserve AVPreserve Media Archiving & Data Management Consultants

More information

Hadoop Shell Commands

Hadoop Shell Commands Table of contents 1 DFShell... 3 2 cat...3 3 chgrp...3 4 chmod...3 5 chown...4 6 copyfromlocal... 4 7 copytolocal... 4 8 cp...4 9 du...4 10 dus... 5 11 expunge... 5 12 get... 5 13 getmerge... 5 14 ls...

More information

Week 1 Lesson 2: Creating Shell Scripts, Linux Commands

Week 1 Lesson 2: Creating Shell Scripts, Linux Commands Week 1 Lesson 2: Creating Shell Scripts, Linux Commands 1 Chapter Objectives In this chapter, you will: Learn how to create Shell Scripts Commenting / Making Portable Shell Scripts Making Shell Scripts

More information