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Full Discussion: Input String Manipulation
Top Forums UNIX for Dummies Questions & Answers Input String Manipulation Post 302218215 by radoulov on Thursday 24th of July 2008 04:05:58 PM
Old 07-24-2008
Did you try getopts?

Code:
zsh-4.3.4% cat s
#! /bin/ksh

(( $# < 1 )) && { printf "Usage: $0 ...\n"; exit 1;}

while getopts ":epxz" opt; do
  case "$opt" in
     e ) print "e is set" ;;
     p ) print "p is set" ;;
     x ) print "x is set" ;;
     z ) print "z is set" ;;
    \? ) echo "Usage: $0 [OPTION] ... " ;
return 1 ;;
  esac
done

For example:

Code:
zsh-4.3.4% ./s
Usage: ./s ...
zsh-4.3.4% ./s -t
Usage: ./s [OPTION] ...
zsh-4.3.4% ./s -e
e is set
zsh-4.3.4% ./s -epxz
e is set
p is set
x is set
z is set
zsh-4.3.4% ./s -e -p -z
e is set
p is set
z is set

 

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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