Outline. Unix shells Bourne-again Shell (bash) Interacting with bash Basic scripting References
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1 Ryan Hulguin
2 Outline Unix shells Bourne-again Shell (bash) Interacting with bash Basic scripting References
3 Unix shells This lets users issue commands to the Unix operating system Users can interact with various parts of the Unix operating system such as the input/output system the scheduler memory management The shell is simply a program whose job is to execute other programs Different shells exist such as the C shell (csh), the Korn shell (ksh), the Bourne shell (sh) and the Bourne-again shell (bash)
4 Bourne-again shell (bash) bash is the default shell on modern Linux distributions as well as Mac OS X bash is both a command interpreter and a highlevel programming language When used as a programming language, bash processes commands stored in files called shell scripts Most system shell scripts are written for bash Like other programming languages, bash has variables and control flow commands (i.e. for loops and if statements)
5 Active participation It is highly encouraged to try all the examples as we go along You may use your own shell from a Linux/Mac terminal You may also use the free linux shell provided by
6 Shell Variables Variables in a bash script are typically written with all-uppercase letters This is not a strict requirement Assignment is done using the equals sign without spaces VAR1= test string Referencing the value of a variable is done using the dollar sign echo My assigned variable contains $VAR1 An exception to this rule is evaluating arithmetic expressions, covered later
7 Documenting bash scripts with comments It is always a good idea to document bash scripts with comments Any text immediately following the # character will be considered a comment and ignored by the shell # This is a comment The exception to this the shebang #! found at the top of most scripts The shebang specifies which shell to use to execute the script Example: #!/bin/bash
8 Command substitution To assign the value of another bash command/ script to a variable, command substitution is used TODAYS_DATE=$(date +%m/%d/%y ) TODAYS_DATE=`date +%m/%d/%y ` echo $TODAYS_DATE echo $(TODAYS_DATE) Newer scripts will use $(), while older scripts will use backticks ` ` The $() convention makes it easier to read and nest commands within commands
9 Our first bash script Visit Click Start my session nano hello_world.sh Ctrl-X Y to save modified buffer Hit return/ enter to accept filename
10 Running our first bash script We can run our bash script several ways We can pass the script to the shell of our choice /bin/bash./hello_world.sh /bin/sh./hello_world.sh We can specify which shell to use with the shebang, and then make the script executable nano hello_world.sh Insert #!/bin/bash at the top Ctrl x, y, enter to save chmod u+x./hello_world.sh./hello_world
11 Embedding variable values in text Suppose you have the following variable defined PREFIX=sun If you wanted to echo the following words using this prefix: sunflower, sunshine, sunset you would use echo ${PREFIX}flower echo ${PREFIX}shine echo ${PREFIX}set Note the use of the braces Without the braces, echo $PREFIXflower would return nothing since the variable PREFIXflower is undefined
12 Using parameters in a bash script scripts are often called using input parameters To reference these parameters use ${position #} where position # is the specific parameter to use that starts at 1 Example: echo The first input parameter is ${1} echo The second input parameter is ${2} You can also get the number of input parameters passed using ${#} echo There were ${#} input parameters passed
13 Setting default values for parameters Many times you would like parameter set to a default value if none is given Suppose you have a script that is expecting a directory as an input parameter, but needs to default to the $HOME directory if none is specified default_param.sh: #!/bin/bash # List the contents of the 1 st argument # Use the $HOME directory if none is specified TARGET=${1:-$HOME} ls $TARGET
14 Setting default values for variables Just like parameters, variables can also have default values assigned to them default_variable.sh: #!/bin/bash # Show the first 5 lines of $TARGET file TARGET=/proc/cpuinfo head -5 ${TARGET:=./default_variable.sh} echo TARGET file is $TARGET unset TARGET echo head -5 ${TARGET:=./default_variable.sh} echo TARGET file is $TARGET
15 The for control structure for loop-index do commands done The loop-index takes on the values of each of the command line arguments Example: # Display all of the command line arguments for INPUT_ARG do echo $INPUT_ARG done
16 The for in control structure for loop-index in argument-list do commands done The loop-index takes on the values of each argument in the specified argument-list Example: # Display all of the animals in a given list for ANIMAL in lions tigers bears do echo $ANIMAL done
17 The for control structure with C like syntax bash also allows a syntax for for loops much like the C programming language # count from 1 to 10 on a single line for (( count=1; count<10; count+=1 )) do echo n $count done echo
18 References A Practical Guide to Linux Commands, Editors, and Shell Programming by Mark G. Sobell Bash Cookbook: Solutions and Examples for Bash Users by Carl Albing, JP Vossen, and Cameron Newham These slides will be posted on
19 Questions? / Contact Ryan Hulguin ryan-hulguin@tennessee.edu
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