Net::SSH2 is the preferred module now, see
A little demo for Net::SSH2, but here is an old sshopen2 idea
#!/usr/bin/perl
# to login to work machine, rewrite /$home/etc/hosts entry
use strict;
use warnings;
use Net::SSH qw(sshopen2);
my $ppp0 = `/sbin/ifconfig ppp0`;
die "Invalid output from ifconfig! Received: $ppp0\n"
unless ($ppp0 =~ m/(\d+\.\d+\.\d+\.\d+)/);
my $ip = $1;
my $user = "jrak";
my $host = "mail.myhost.org";
my $cmd = "perl -pi -e 's/^\\d+\\.\\d+\\.\\d+\\.\\d+\thome/$ip\thome/
+'
/home/jrak/etc/hosts";
sshopen2( "$user\@$host", *READER, *WRITER, "$cmd" ) or die "ssh: $!";
while (<READER>) {
print $_;
}
close(READER);
close(WRITER);
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