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Full Discussion: [KornShell]: Why getopts doesn't detect disabled switches in this script?
Top Forums Shell Programming and Scripting [KornShell]: Why getopts doesn't detect disabled switches in this script? Post 302891684 by dariyoosh on Friday 7th of March 2014 09:02:09 AM
Old 03-07-2014
Question [Solved] [KornShell]: Why getopts doesn't detect disabled switches in this script?
Hi,

My environement
Code:
OS:           Linux Fedora Core 17 X86_64
KSH version:  sh (AT&T Research) 93u+ 2012-08-01

As I understand inside a Kornshell script, the getopts statement allows to collect information about the switches provided for the script (if any). Besides, it is possible to enable/disable those switches respectively by preceding each switch letter with either - or +.

I just wanted to see this in pratice. Therefore I wrote the following code which unfortunately does not give the expected output.
Code:
#!/usr/bin/ksh
while getopts :xy arguments
do
    case $arguments in
        x)
            print "x on"
            ;;
        +x)
            print "x off"
            ;;
        y)
            print "y on"
            ;;
        +y)
            print "y off"
            ;;
        \?)
            print "unknown switch"
            ;;
    esac
done

And here is what I get when I run the above script in my linux terminal (myscript.ksh is the name of my script)
Code:
$ ./myscript.ksh -x
x on
$ ./myscript.ksh +x
$ ./myscript.ksh -y
y on
$ ./myscript.ksh +y
$

As you can see whenever a switch is preceded by - (therefore enabled) the script prints the corresponding message but whenever it is preceded by the + (disabled) the scripts doesn't seem to do anything and there is no message printed.

Could you kindly help me understand the problem in my script?

Thanks in advance,
 

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LEARN ABOUT DEBIAN

shcomp

SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME

       shcomp - compile a ksh93 shell script

SYNOPSIS

       shcomp [ options ] [infile] [outfile]]

ORIGIN OF THIS MAN PAGE

       This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output.

DESCRIPTION

       Unless  -D  is  specified,  shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute
       with the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile is omitted, then the results will be written to standard output.  If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       -D, --dictionary
	      Generate a list of strings that need to be placed in a message catalog for internationalization.

       -n, --noexec
	      Displays warning messages for obsolete or non-conforming constructs.

       -v, --verbose
	      Displays input from infile onto standard error as it reads it.

       --man  Displays this man page on standard error and exits.

       --help Shows a short help message and exits.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

DEBIAN WARNING

       On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93.  Any other ksh will be
       unable to run the compiled script.

EXAMPLE

       ( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin &&
       chmod 755 myscript.bin
       ./myscript.bin

SEE ALSO

       ksh(1)

IMPLEMENTATION

       version	       shcomp (AT&T Labs Research) 2012-02-29
       author	       David Korn <dgk@research.att.com>
       copyright       Copyright (c) 1982-2012 AT&T Intellectual Property
       license	       http://www.eclipse.org/org/documents/epl-v10.html

KSH93								  Fri Jun 3 2005							 SHCOMP(1)
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