Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re: returning a specific value from a command

by Anonymous Monk
on Oct 28, 2011 at 14:38 UTC ( #934412=note: print w/ replies, xml ) Need Help??


in reply to returning a specific value from a command

We are not clairvoyants. Provide sample input from vmstat, then define clearly which part you want to extract.


Comment on Re: returning a specific value from a command
Re^2: returning a specific value from a command
by pvaldes (Chaplain) on Oct 28, 2011 at 15:06 UTC

    vmstat reports information about processes, memory, paging, block IO, traps, disks and cpu activity.

    the output is like this

    procs ------memory------- --swap-- ---io--- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 9999 9999 9999 0 0 99 99 9999 999 9 9 99 9

    Let's see...

    Your target is the 13th number in the third line, so you need to discard lines 1 and 2, and then print this element

    my @stat = `vmstat`; foreach $line(@stat){ if ($line =~ /^procs/){next} if ($line =~ /us/){next} else {chomp $line; my @fo = split /[[:blank:]]+/, $line; print "Message: CPU user time: $fo[13]\n";} }
      This is a HUGE help... Thanks very much!!!

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://934412]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (8)
As of 2014-08-23 10:51 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The best computer themed movie is:











    Results (173 votes), past polls