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Full Discussion: [bash] wanted: function with a clean way for multiple return values
Top Forums Shell Programming and Scripting [bash] wanted: function with a clean way for multiple return values Post 302977116 by Don Cragun on Tuesday 12th of July 2016 07:35:05 PM
Old 07-12-2016
Without knowing what arguments you intend to pass to _exec and what output you are hoping to produce, we can only make wild guesses about what might or might not work for you.

But using echo to print arbitrary text is dangerous (especially when the operating system you're using and the environment variables in place when your script is invoked are unspecified).

Is there a limited set of commands that will be passed to your _exec function as the 1st operand, or can the user specify any command available on your system? Will your _exec function be invoked with a command and parameters in a quoted string passed as the 1st operand; or just a command name that will be executed with no parameters?

How many terabytes of output might be produced by the command given as the 1st operand to your _exec function?

Where is the variable ESHELLERR assigned a value (or are you expecting _fatal to be called with three operands instead of four)?
 

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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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