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  1. or download this
    use strict;
use warnings;
...
warn "Flag set\n" if $flag;

die "Farewell, cruel world\n";
  2. or download this
    C:> perl fred
The beginning
...
Farewell, cruel world

C:>
  3. or download this
    C:> perl fred > fred.out
Flag set
...
The beginning

C:>
  4. or download this
    C:> perl fred > fred.out 2>&1

...
Farewell, cruel world

C:>