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First, your $errorstate variable is named the opposite of what it should be. You set it to 1 when the input is formatted properly! Then, the bottom half of your code can be idiomized using some built-in variables in Perl. And are you sure you want to REMOVE the '#' from lines starting with '#port'? You also do some unnecessary work of checking to see if a regex matches before doing a substitution using that regex.

It turns out you can get rid of $errorstate altogether, and just loop until $sshport has a value.

#!/usr/bin/perl use strict; use warnings; my $sshport = 0; until ($sshport) { print "Please enter SSH port number> "; chomp($sshport = <STDIN>); $sshport = 0 unless $sshport =~ /^[1-9]\d{1,9}$/; } { local $^I = ".old"; # the "in-place edit backup extensio +n" variable local @ARGV = ("sshd_config"); # the files to edit in-place while (<>) { s/^(#?)port .*/$1Port $sshport/i; # this KEEPS the '#' character, # which I think is the correct behavior } }
See perlvar for information about $^I.

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re: Defactor this code by japhy
in thread Defactor this code by xerophyte

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