Given this code:

    #!/usr/bin/perl

    # std.pl

    use strict;
    use warnings;

    while (my $line = <STDIN> ){

        if ($line =~ /te/){
            print "hi";
        }
    }
[download]

...and this input file:

# std.txt
a
three
text
[download]

This: perl std.pl < std.txt works, as does running perl std.pl and entering text on the command line, on both Windows and Linux.

How are you grabbing the file, and what does it contain?

-stevieb