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Full Discussion: General question about passing variables among shell scripts
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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LEARN ABOUT SUSE

git-sh-setup

GIT-SH-SETUP(1) 						    Git Manual							   GIT-SH-SETUP(1)

NAME

       git-sh-setup - Common git shell script setup code

SYNOPSIS

       . "$(git --exec-path)/git-sh-setup"

DESCRIPTION

       This is not a command the end user would want to run. Ever. This documentation is meant for people who are studying the Porcelain-ish
       scripts and/or are writing new ones.

       The git sh-setup scriptlet is designed to be sourced (using .) by other shell scripts to set up some variables pointing at the normal git
       directories and a few helper shell functions.

       Before sourcing it, your script should set up a few variables; USAGE (and LONG_USAGE, if any) is used to define message given by usage()
       shell function. SUBDIRECTORY_OK can be set if the script can run from a subdirectory of the working tree (some commands do not).

       The scriptlet sets GIT_DIR and GIT_OBJECT_DIRECTORY shell variables, but does not export them to the environment.

FUNCTIONS

       die
	   exit after emitting the supplied error message to the standard error stream.

       usage
	   die with the usage message.

       set_reflog_action
	   set the message that will be recorded to describe the end-user action in the reflog, when the script updates a ref.

       git_editor
	   runs an editor of user's choice (GIT_EDITOR, core.editor, VISUAL or EDITOR) on a given file, but error out if no editor is specified
	   and the terminal is dumb.

       is_bare_repository
	   outputs true or false to the standard output stream to indicate if the repository is a bare repository (i.e. without an associated
	   working tree).

       cd_to_toplevel
	   runs chdir to the toplevel of the working tree.

       require_work_tree
	   checks if the repository is a bare repository, and dies if so. Used by scripts that require working tree (e.g.  checkout).

       get_author_ident_from_commit
	   outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.

AUTHOR

       Written by Linus Torvalds <torvalds@osdl.org[1]>

DOCUMENTATION

       Documentation by Junio C Hamano and the git-list <git@vger.kernel.org[2]>.

GIT

       Part of the git(1) suite

NOTES

	1. torvalds@osdl.org
	   mailto:torvalds@osdl.org

	2. git@vger.kernel.org
	   mailto:git@vger.kernel.org

Git 1.7.1							    07/05/2010							   GIT-SH-SETUP(1)
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