Or:
my (@cmds) = ("HELO", "dom:$domain", "ipaddr:$ipaddress", "addzone");
while (@cmds)
{
print $ns1 shift(@cmds), "\n";
$line = <$ns1>; # don't need the sleep;
# the read should block until
# a line is available.
defined($line) or last; # quit if connection closed
# (could die instead)
print $line; # don't need \n now, $line
# not chomped
($line =~ /^CAIO$/) and last;
# $ can handle trailing
# newline, with no
# significant speed penalty
# (should be optimized by
# regex engine)
}
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