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#!/usr/bin/perl
use warnings;
...
print @who;

$chan->close;

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[root@lpo-wiki-01 ~]# ./ssh.pl localhost
Linux lpo-wiki-01 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:02 EDT 2007 i6
+86 i686 i386 GNU/Linux
...
[root@lpo-wiki-01 ~]# ./ssh.pl yoda
cant connect to yoda
[root@lpo-wiki-01 ~]#