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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 OSF1

shift

shift(1)							   User Commands							  shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
	   able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
	   performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  shift(1)
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