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Shell Programming and Scripting

Script to monitor IOwait

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# 1  
Old 11-14-2012
Script to monitor IOwait
Hello, I need to monitor IOwait on a server and have started this script directly on the ssh prompt.

Effectively it almost does what it is supposed to do, but I have no idea how to stop it?

How can I make it run it as a file based bash script?

Code:
(
    iostat -xk 1 /dev/sdb2 | \
    perl -MPOSIX=strftime -ne '
        $|=1;
        next unless /^(sdb2|\s+\d)/;
        if (/^\s+/) {
            s/\s*$/ /;
            $_=strftime("%H:%M:%S ", localtime time).$_
        }
        print
    ' &> /tmp/iostat.log
) &

Last edited by Scrutinizer; 11-16-2012 at 05:24 AM.. Reason: quote tags => code tags
# 2  
Old 11-14-2012
which plateform/OS do you run ?
# 3  
Old 11-14-2012
Hello ctsgnb, I do use centos 6
# 4  
Old 11-14-2012
Does your OS have the command "watch" ?
# 5  
Old 11-15-2012
yes, it does. watch available
# 6  
Old 11-16-2012
Which shell are you currently using ?
Are you willing to monitor this interactively or only log it into a file ?
Last edited by ctsgnb; 11-16-2012 at 04:34 AM..
# 7  
Old 11-16-2012
This is what I would use (based on awk as I avoid perl like the plague):

Code:
#!/bin/sh
iostat -xk 1 /dev/sdb2 |
awk '
BEGIN { cmd="date +%H:%M:%S" }
NF == 6 { cmd|getline now;
  printf("%s %s\n",now,$0);
  close(cmd)
}'
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