cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post: 302223761

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Operating Systems Linux Gentoo cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post 302223761 by broli on Monday 11th of August 2008 10:20:55 AM

08-11-2008

Registered User

Quote:

Originally Posted by era

Something like this maybe.

Code:

#!/bin/sh

while :
do
    top -b -n -1 |
    awk 'NR > 5 { mem[$12] = $10; }
        NR==3 { printf "^fg(green)CPU " $5 " ** "; next; }
        NR==4 { total=$2; free=$6; buffers=$8; next; }
        NR==5 { cached=$8; next; }
        NR==8, NR==12 { printf "[^fg(cyan)" $12 "(^fg(red)" $9 "^fg(green)]--"; next; }
        NR==13 { printf ">>\n"; next; }
        END { ... sort and extract top 4 items from mem array here ...;
            printf "%2.2f\n", (free+buffers+cached)/total*100 }'
    sleep 4
done | dzen2 --options

I haven't finished the mem part but it's not too complex; you should be able to implement the remaining part of the awk script and sort and pick the output lines you want by searching the forums a bit. The mawk manual page has an example of how to implement a simple sort in awk.

My top prints "Mem: total used free buffers" followed by "Swap: total used free cached" on lines 4 and 5; I'm not entirely sure which of the "free" and "total" fields you want, but extracting the fields you want (provided you are sure which ones you want) should be similarly straightforward. I've put in placeholders for those. A complication is that the output has a human-readable suffix like "k" which I imagine might vary, so properly you should parse that before doing the math on the resulting numbers.

yeah, this thing is growing faster than my speed to read awk info :P
i will look at that and run some tests
the problem, is that all this work only o get a simple percentage of free mem, is growing in complexity and footprint
to a point where i dont know if its worth the problem
maybe i can make use of an external program to give me that info.
maybe doit myself in C? .... (actually, stole the related code of wmmem )

broli

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LEARN ABOUT DEBIAN

dpkg-awk

DPKG-AWK(1)						      General Commands Manual						       DPKG-AWK(1)

NAME

       dpkg-awk - Utility to read a dpkg style db file

SYNOPSIS

       dpkg-awk [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ... -- <out_fieldname> ..

DESCRIPTION

       dpkg-awk  Parses  a  dpkg status file (or other similarly formatted file) and outputs the resulting records.  It can use regex on the field
       values to limit the returned records, it can also be told which fields to output, and it can sort the matched fields.

OPTIONS

       -f filename
       --file filename
	      The file to parse.  The default is /var/lib/dpkg/status.

       -d [#]
       --debug [#]
	      Each time this is specified, it increased the debug level.

       -s field(s)
       --sort field(s)
	      A space or comma separated list of fields to sort on.

       -n field(s)
       --numeric field(s)
	      A space or comma separated list of fields that should be interpreted as numeric in value.

       -rs ??
       --rec_sep ??
	      Output this string at the end of each output paragraph.

       -h
       --help Display some help.

       fieldname
	      The fields from the file, that are matched with the regex given.	The fieldnames are case insensitive.

       out_fieldname
	      The fields from the file, that are output for each record.  If the first field listed begins with ^, then the list  of  fields  that
	      follows will NOT be output.

BUGS

       Be  warned  that  the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs in this pro-
       gram.

       This program comes with no warranties.  If running this program causes fire and brimstone to rain down upon the earth, you will be on  your
       own.

       This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg.

AUTHOR

       Adam Heath <doogie@debian.org>

DEBIAN
								 Debian Utilities						       DPKG-AWK(1)

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