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#!/usr/bin/env perl

...
    warn "It is assumed that ssh key exchange has already been setup.\
+n";
    die "\n";
}

my_machine> net.pl -c 'date' camhydmur001b{1,2,3}
       camhydmur001b3)  Fri May 10 12:15:58 GMT 2013
...
       camhydmur001b1)  Fri May 10 12:15:58 GMT 2013

       camhydmur001b2)  Fri May 10 12:15:58 GMT 2013

my_machine> net.pl -c 'ls /junk' camhydmur001b{1,2,3}
ls: cannot access /junk: No such file or directory
...

ls: cannot access /junk: No such file or directory
********************

$cmd .= ' 2>&1';