Cecil Westerhof wrote:
> Under Linux I like to get the most expensive processes. The two most
> useful commands are:
> ps -eo pid,user,pcpu,args --sort=-pcpu
> and:
> ps -eo pid,user,pcpu,args --sort=-vsize
>
> In my case I am only interested in the seven most expensive processes.
> For this I wrote the following script.
Don’t. Use
ps -eo pid,user,pcpu,args --sort=-pcpu | head -n 8
or
ps -eo pid,user,pcpu,args --sort=-pcpu | sed -n '2,8p'
and the like instead. (procps ps(1) also has an output modifier to omit
the headers, but I could not get that to work with the sorting just now.
[Thanks for pointing out the “--sort” option of *procps* ps(1) 3.3.10.
I was not aware of it, and had used
$ alias cpu
alias cpu='ps -ww aux | sort -nk3 | tail'
instead.]
> ========================================================================
> #!/usr/bin/env python3
>
> import subprocess
> import sys
>
>
> def give_output(param):
> output = subprocess.check_output(([
> 'ps',
> '--columns={0}' .format(max_line_length),
> '-eo',
> 'pid,user,start_time,{0},args'.format(param),
> '--sort=-{0}' .format(param)
> ])).splitlines()
> […]
> ========================================================================
>
> Is this a reasonable way to do this?
No.
> Getting the parameter is done quit[e] simple, but I did not think fancy
> was necessary here.
It is not.
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