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Top Forums Shell Programming and Scripting General question about passing variables among shell scripts Post 302805263 by hanson44 on Thursday 9th of May 2013 11:42:04 PM
Old 05-10-2013
Quote:
So how do you pass variables into a shell script?
You pass variables from a.sh to b.sh by adding the variable after the script name, such as b.sh "$x". You receive variables in b.sh by using $1 for the first variable passed, $2 for the second, etc. Here is an example you can look at that I think makes it clearer:
Code:
$ cat a.sh
x=`date`
echo x in a.sh: $x
echo Passing x variable to b.sh script
b.sh "$x"

Code:
$ cat b.sh
echo Entering b.sh script
x="$1"
echo x in b.sh: $x
echo About to do function on x variable
y=`echo $x | cut -d " " -f 1`
echo "y (first field of x): $y"

Code:
$ ./a.sh
x in a.sh: Thu May 9 20:38:20 PDT 2013
Passing x variable to b.sh script
Entering b.sh script
x in b.sh: Thu May 9 20:38:20 PDT 2013
About to do function on x variable
y (first field of x): Thu

Note that the variable was passed as "$x" instead of $x, because without the quotes $1 would have just been "Thu".
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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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