Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

system() doesn't return the output, just the exit status. There are other ways of executing programs that will give you the exit status. For instance, use open() with a pipe:

open(EXEC, '-|', 'ps', '-deaf | ', 'grep', 'httpd |', 'grep', '-v', 'grep |', 'wc', '-l') or die "Can't exec: $!\n"; # Now read the output just like a file while(my $line = <EXEC>) { chomp $line; print "$line\n"; } close(EXEC);

Backticks and qx// also work:

my $input = `ps -deaf | grep httpd | grep -v grep | wc -l`; my $input2 = qx/ps -deaf | grep httpd | grep -v grep | wc -l/; # Same +thing

----
Reinvent a rounder wheel.

Note: All code is untested, unless otherwise stated


In reply to Re: Capturing System Output by hardburn
in thread Capturing System Output 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":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (2)
As of 2022-05-24 03:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you prefer to work remotely?



    Results (82 votes). Check out past polls.

    Notices?