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Shell Programming and Scripting

How to validate user's input..?

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# 1  
Old 03-08-2013
How to validate user's input..?
Code:
 $Input_filename=$ARGV[0];
	
if (!-d $Input_filename  && ! -e $Input_filename)
{
	print "USAGE: Please enter '$ABCD/def/dsed.txt' as an arguement \n";
	exit;
}


1. Input Is suppose to be something like "$ABCD/def/dsed.txt".
if the input is wrong the script should throw an ERROR message.

if user enters $ABCD only, error message should be displayed.

if the user enters "$ABCD/def/" a error message shold be displayed.

do i need any regex to check it out??

PLEASE SUGGEST.....
# 2  
Old 03-08-2013
What programming/scripting language is this?
# 3  
Old 03-08-2013
its perl...
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