Hi. I'll make this short and sweet. Doing ps -ef to check for some processes running on a machine. when they're running, there's no problem. When the proc ISN'T running (which is what I want to know) I'm getting nothing. Basically doing this.
use strict; my @procs = qw|mozilla evolution|; foreach my $process(@procs) { open ( PROCS, "ps -ef |grep $process |grep -v grep|" ) or die "Cou +ldn't open procs $!"; while ( my $proc = <PROCS> ) { chomp $proc; if ( defined( $proc ) ) { print "looks okay here\n"; } else { print "couldn't find $process - you're screwed\n"; } } }
To test this, I'll change Mozilla to Gozilla in the array assignemnt at the top. Since when it loops through, running ps, grepping for Gozilla, it'll get nothing - is that not undefined in this case? In short, if I run the above, grepping for procs that don't exist, I get nothing in standard output. If I'm totally off on that, can someone point me into the direction I need to go in to check for when something WON'T be there?

In reply to undefined question by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.