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  1. or download this
    $ cat if-mail.pl 
#!/usr/bin/perl
exit 0 unless (my @lines = <STDIN>);
...
$ ./if-mail.pl root@localhost -s "try running echo *"
TEST
^D
  2. or download this
    $ mail
       From: Krylov Ivan <aitap@tarkus>
...

------ This is a copy of the message, including all the headers. -----
+-
<...>