Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

Re: How to end "do" with Ctrl-C

by pfaut (Priest)
on Dec 02, 2008 at 22:33 UTC ( #727508=note: print w/replies, xml ) Need Help??

in reply to How to end "do" with Ctrl-C

You need to trap the INT signal.

our $stopit = 0; $SIG{INT} = sub { $stopit++; }; while (!$stopit) { system("netstat -an | grep $line"); sleep 10; }
90% of every Perl application is already written.

Replies are listed 'Best First'.
Re^2: How to end "do" with Ctrl-C
by kennethk (Abbot) on Dec 02, 2008 at 23:03 UTC
    Yeah, what pfaut said. As an additional note, your chomp removes the end line, so your test would always pass. If you really want to catch bad input, you could try:
    use strict; my $port = shift; our $stopit = 0; $SIG{INT} = sub { $stopit++; }; if (!$port or $port =~ /\D/) { print "usage: program port_num\n"; } else { while (!$stopit) { print system("netstat -an | grep $port"), "\n"; sleep 10; } }

    or whatever variant will get you what you want.

      print system("netstat -an | grep $port"), "\n";

      That should be

      system("netstat -an | grep $port");


      print qx{netstat -an | grep $port};


      print grep /$port/, qx{netstat -an};
      Thank you, works great!

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://727508]
[stevieb]: In msg, how do I message someone with a space in their name. For example, I want to privately message "Your Mother", but am unsure of how to do so. Link/tips?

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (5)
As of 2018-03-23 00:34 GMT
Find Nodes?
    Voting Booth?
    When I think of a mole I think of:

    Results (287 votes). Check out past polls.