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Full Discussion: Exiting the script if the character is not recognized
Top Forums Shell Programming and Scripting Exiting the script if the character is not recognized Post 302897029 by Akshay Hegde on Thursday 10th of April 2014 02:16:24 PM
Old 04-10-2014
Code:
#!/bin/bash

echo -n "Read the letter >(enter a or b or c) "
read letter

# One easiest way to Compare 
for i in a b c; do
	[ "$i" = "$letter" ] && break
done

# ok will be zero if true else 1
ok=$?

# Compare
if [ $ok -ne 0 ];then
	echo "unacceptable character"
else
	echo "Character Accepted"
fi

Syntax for string
Code:
# Syntax for string 

a="A"; b="A";

if    [ "$a" != "$b" ]; then
	echo "Not Equal"
elif  [ "$a" = "$b" ]; then
    	echo "Equal"
fi

This User Gave Thanks to Akshay Hegde For This Post:
web2moha
 

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LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)
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