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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 REDHAT

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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