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print "What IP address do you want to allow ssh logins from? ";
$_ = <>;
length($allowed_ipaddr) or die "Sorry, '$_' is not a valid IP addr
$allowed_ipaddr = inet_ntoa($allowed_ipaddr); # convert to dotted
+quad, if necessary.
print " You have authorized the host with IP address $allowed_ipad
+dr to log in via ssh.\n";
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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