Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

How do I start two programs without waiting for first one to be finished ?

( #37063=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Oct 17, 2000 at 04:11 UTC
Q&A  > programs and processes


Answer: How do I start two programs without waiting for first one to be finished ?
contributed by tye

system( 1, "first" ); # Won't wait. system( "second" ); # Will wait.

This is could be very portable though it also still appears to be mostly undocumented. ):

Update: I posted this long ago and later learned that system(1,...) was never allowed to work except on Windows (and OS/2, for which it was originally written). Any documentation on it appears to be relegated to perlport.

     - tye
Answer: How do I start two programs without waiting for first one to be finished ?
contributed by Zombie robyn

On Windows, I use this to launch one program and not wait, and then another with waiting.

use Win32::Process; my $path = "C:\\mydirectory\\myprogram.exe"; Win32::Process::Create( $Process, $path, "myprogram", 0, NORMAL_PRIORITY_CLASS, "." ) or die "Can't Create - $!"; chdir "c:\\Program Files\\CoolRuler"; system "coolruler.exe";
Answer: How do I start two programs without waiting for first one to be finished ?
contributed by walto

Linux:  system "first &";
Windows:  system "start /b first";
Both start first in background.

Answer: How do I start two programs without waiting for first one to be finished ?
contributed by runrig

Fork them and run in the background:

system "( sleep 10; ls -l ) &";
Or use fork() explicitly:
if ( $pid = fork ) { # this is the parent } elsif ( defined $pid ) { # this is the child system "myprogram"; } else { die "can't fork: $!"; }

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others romping around the Monastery: (8)
    As of 2015-07-02 23:40 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (47 votes), past polls