How-to enforce check on getopts command Post: 302987372

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Top Forums Shell Programming and Scripting How-to enforce check on getopts command Post 302987372 by bakunin on Thursday 8th of December 2016 01:00:47 PM

12-08-2016

Registered User

Quote:

Originally Posted by mohtashims

Why is it giving error when it should have worked ?
Can you please tell me whats wrong ??

Yes: you have put everything - including the shebang line, which makes absoultely no sense - into a function and then called the function with no arguments. What is getopts supposed to work on when there are no options provided, hm?

You could have found that out easily yourself by putting an echo-statement here:

Code:

   f)
       file_in="$OPTARG"
       # a test for the file being readable/existing would fit nicely here, no?
       echo "now in -f option handling"
       lFUsed=1               # change flag when -f was indeed used
       ;;

and you would have immediately noticed that this part was not even executed. You could also have put a testwise echo-statement into the while-loop and show the values of "$opt" and "$OPTARG" during executing which would have yielded the same information. Finally you could have tried the sample script UNMODIFIEDLY first before you tinkered with it.

Don't get me wrong, it is meant to be tinkered with. But trying to understand it first before doing experiments (like putting everything into a function) is usually a good idea.

I hope this helps.

bakunin

bakunin

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LEARN ABOUT X11R4

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)

Linux								       Epoch								     Linux

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