Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Comment on

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

Hello, monks

I have a fast question:

I want to match unix`s ps aux, and I have some idea I realized and it is working, I am just wondering if the approach is good, decent or poor noob-a-like.

#!/usr/bin/perl -w use strict; open(PS, "ps aux|") || die "Can`t open PS filehand: $!\n"; my $strindex; #still a global var... argh! my %prochash=(); while ( <PS> ) { #obtain the length to match according to ps aux { print "#Enter the block just once\n"; last if $strindex; $strindex = index($_, "STAT"); #obtain how characters the RegEx should not match } #no more of this besides the first line if ( /^.{$strindex}(?<stats>.{1,4})\s){1}?/i ) { $prochash{$+{stats}}++; #count processes status } } close(LS); #or don`t if you want to maintain the PSes while (my($k, $v) = each(%prochash) ) { print "$k is $v times \n"; }

Any better ideas will be most appriciated. But not too advanced stuff since I am still a newbie.

Update

I was able to parse "top" command too assigning it to a dseired by me hash. Here is the codeblock:

#!/usr/bin/perl -w ##Copyright yours truly Ilian Z. use strict; sub handler { print "Interupt catch\n"; die "Dead...\n"; } =pod open LS, "ps aux|" or die "Can`t open filehandle: $!\n"; my %phash=(); my $strm; while ( <LS> ) { { print "#enter the block"; if ( $strm ) { last; } $strm = index($_, "STAT"); } if ( /^.{$strm}(?<status>.{1,4}\s){1}?/i ) { $phash{$+{status}}++; } } close LS; while ( my($k, $v) = each(%phash) ) { print $k, " ===> ", $v, "\n"; } =cut open TOP, "top|" || die "Can`t open 'top' command: $!\n"; my %pnc = (); my @tmp=(); my ($pid, $command); while ( my $match = <TOP> ) { { next if $command > 0 ; $command = index($match, "COMMAND"); $command++; # end block after 1st verify } next if $command < 1 ; #if we don`t match the index let`s skip +below #Here we make a process ID the key and the command the value #a bit ugly but normal for Camel ($pnc{($match =~ /(?<pid>\d+)/) ? $+{pid} : 0} = ($match =~ /^.{$command}\s(?<cmd>.+)/i)?$+{cmd} : 0 ) || next +; } close TOP; while ( my ($k, $v) = each(%pnc) ) { if ( defined $k and defined $v ) { print "Proc.ID#",$k," runs command: ", $v,"\n"; } }

Hope that some UNIX sys admins will benefit from the idea and the code.

You won`t see anything in the terminal, just press 'Q' sometime to see the hash assignment. It`s a baby code and there can be many options to it. If I get better I`ll definitely modularize it and hope to help some world`s problems.

P.S.

I had no idea that parsing TOP is actually not exactly what you think and what you see in the terminal. After top >> top.log and review it in texteditor I saw many control characters so  /^(\d+)\s/ never worked since no new line began with a digit but a control character!!! Awesomely godness! Never knew that stuff!


In reply to A small queestion to match processes by heatblazer

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!
  • 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 having an uproarious good time at the Monastery: (17)
    As of 2015-07-07 19:13 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 (93 votes), past polls