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Full Discussion: getopts alternative?
Top Forums Shell Programming and Scripting getopts alternative? Post 302182212 by era on Sunday 6th of April 2008 01:43:39 AM
Old 04-06-2008
I guess fpmurphy alludes specifically to ksh so you may be lucky there.

Option processing "by hand" is not such a big deal, either.

Code:
while true
do
  case $# in 0) break ;; esac
  case $1 in
    -d|--dir) shift; dir=$1; shift ;;
    -u|--user) shift; user=$1; shift ;;
    -a|--all) shift; all=true ;;
    -|--) shift; break;;
    -h|--help) cat <<______EOF >&2; exit 0 ;;
Syntax: $0 [ -d directory | --dir directory ] [ -u user | --user user ] | --help
______EOF
    -*) cat <<______EOF >&2; exit 2 ;;
Invalid option $1.  Try $0 --help to see available options.
______EOF
    *) break ;;
  esac
done

When it comes to single dash vs double dash for long options, option clustering vs no option clustering, requiring and/or permitting an equals sign between a long option and its value, etc, you're in a twisty maze of conflicting standards, all equally non-standard. Personally I'd recommend double dash for long options. Permitting equals signs between options and their values would complicate the code somewhat, as would option clustering for short options (i.e. allowing -au user as a shorthand for -a -u user).

PS. I just whipped this up on the fly, but $dmr knows I've written enough of these to have some routine. It even seems to work, based on quick informal testing.
Last edited by era; 04-06-2008 at 02:46 AM.. Reason: P.S.
 

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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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