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Full Discussion: Creating variables in bash
Top Forums Shell Programming and Scripting Creating variables in bash Post 302626721 by kristinu on Thursday 19th of April 2012 04:49:07 PM
Old 04-19-2012
What do you think of using

Code:
export

Example

Code:
i=4
s4="    "
frmt_titl="${bYl}%s${nClor}\n"
export frmt${w}_titl="${s4}$frmt_titl"




---------- Post updated at 03:46 PM ---------- Previous update was at 03:44 PM ----------

Quote:
Originally Posted by Scrutinizer
You can use eval (or indirect references in bash/ksh93), but you need to be careful with security, especially with user input or input files...

Code:
$ for i in 1 2 3; do eval var$i=$((i*10)); done
$ echo $var1 $var2 $var3
10 20 30

I am planning to define all this stuff in a bash file. Then source it, so that I can use the variables from another script.

---------- Post updated at 03:49 PM ---------- Previous update was at 03:46 PM ----------

Code:


Code:



cat utility.bash

#!/bin/bash
for i in 1 2 3; do eval var$i=$((i*10)); done









Code:



cat test.bash

#!/bin/bash
source utility.bash
echo "$var1"

 

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LEARN ABOUT DEBIAN

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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