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  1. or download this
    # A simple perl script to generate a warning
: perl -we 'my $t; my $t'
...
# same with STDERR to null, aaah the sound of silence
: perl -we 'my $t; my $t' 2>/dev/null
:
  2. or download this
    my $cmd="ls /no/way"; 
my @data=`$cmd`; 
...
    # do something with @ret here ?
}