foreach my $line (@input){
    if ( /fred/ ){

[download]

Is the same as: 


foreach my $line (@input){
    if ( $_ =~ /fred/ ){

[download]

You need to change it to: 


foreach my $line (@input){
    if ( $line =~ /fred/ ){

[download]

In reply to Re: Beginner in perl : Use of uninitialized value by jwkrahn
in thread Beginner in perl : Use of uninitialized value by Perl_Programmer1992

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