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Full Discussion: Use awk/sed/grep with goto statement!
Top Forums Shell Programming and Scripting Use awk/sed/grep with goto statement! Post 302594640 by mirni on Tuesday 31st of January 2012 11:28:47 PM
Old 02-01-2012
And once you have moved into bash or ksh, you can do what you want in the following way:
Code:
#!/bin/bash

function Usage {
   echo "Use me as you wish"
   exit 0
}

a=( D A F D D F )

if grep -q '[^ DF]' <<< ${a[*]} ; then 
   echo contains garbage
   Usage
fi

Then the grep searches for [^ DF], which means anything that is not D, F or space. The output of grep is not needed, so that's why the -q. And the test is performed on the return value of grep. <<< is a redirection from a variable and ${a[*]} (or ${a[@]}) is the whole array.
 

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LEARN ABOUT SUNOS

getusershell

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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