Trying to use file handles for input and output and am getting errors,(i.e. … requires explicit package). Code below. 

#! /usr/bin/perl
use v5.12;
use warnings;

## 2/7/19

    open CONFIG, '<', 'three_Freds';
    open OUTPUT, '>', 'three_Freds.out':

    my $three_Freds = $ARGV[0];
    if (! defined $three_Freds) {
       die "Usage: $0 filename";
       }
  
    while (<$CONFIG>) {     #take one line of input at a time
    chomp;
      s/fred/\n/gi;         
      s/Wilma/Fred/gi;
      s/\n/Wilma/g;
      print $OUTPUT $_ ;
    }

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TIA, the catfish

Here is the error that is being thrown Variable "$CONFIG" is not imported at ./Chapter9_Exer3 line 15. Variable "$OUTPUT" is not imported at ./Chapter9_Exer3 line 20. syntax error at ./Chapter9_Exer3 line 8, near "'three_Freds.out':" Can't use global $0 in "my" at ./Chapter9_Exer3 line 12, near "Usage: $0" Global symbol "$CONFIG" requires explicit package name at ./Chapter9_Exer3 line 15. Global symbol "$OUTPUT" requires explicit package name at ./Chapter9_Exer3 line 20. Execution of ./Chapter9_Exer3 aborted due to compilation errors.

In reply to Usage of File Handles by catfish1116

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