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Simple perl script to filter input from STDIN

1. A simple script in perl to filter some characters. This is usually required in WEB based CGI scripts.
2. The script is executed by:
   echo "try--- my filter" | perl /home/pini/bin/filter_inp.pl
3. The script is simple and is shown below:
   #!/bin/perl
   
   $ok_chars = 'a-zA-Z0-9_';
   while (<STDIN>) {
     $_ =~ s/[^$ok_chars ]//go;
     print "$_\n";
   }#while
   

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