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Full Discussion: [s] in k-shell variable
Top Forums Shell Programming and Scripting [s] in k-shell variable Post 303000516 by luvnola on Thursday 13th of July 2017 01:26:26 PM
Old 07-13-2017
[s] in k-shell variable
In my script, I try to set a variable with a usage message, like this:

Code:
usageMsg="Usage: myScript.sh [nested|silent]"

When I echo out that variable, I get this:
Code:
Usage: myScript.sh s

after doing a lot of trial and error, it seems like the "s" inside the brackets has some special meaning. If I replace the s characters with anything else, it works fine.

eg:

Code:
usageMsg="Usage: myScript.sh [nedted|filent]"

when that is echo'ed out I get:
Code:
Usage: myScript.sh [nedted|filent]


Or boiled down further:

Code:
pshirl:# variable="[a]"
pshirl:# echo $variable
[a]

pshirl:# variable="[s]"
pshirl:# echo $variable
s

pshirl:# variable="[aaaaa]"
pshirl:# echo $variable
[aaaaa]

pshirl:# variable="[sssss]"
pshirl:# echo $variable
s


What gives ? What is so special about the "s" ?
Last edited by Scrutinizer; 07-13-2017 at 03:16 PM.. Reason: code tags
 

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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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