On Wed, 6 Sept 2023 at 18:59, Roberto A. Foglietta
<[email protected]> wrote:
> comw_pid()
> {
> local str
> # RAF: the /proc/$pid/comm contains the first 15 chars + ending \n
> str=$(echo -n $*| tr ' ' '\n'| sed -e "s,\(.\{15\}\).*,^\\1$,"| tr '\n'
> '|')
> str=$(grep -nE "$str" /proc/[1-9]*/comm 2>/dev/null | cut -d/ -f3)
> echo $str | grep --color=never .
> }
For those who cares, this is the new version of the function with the
regexp correction:
comw_pid()
{
local str
# RAF: the /proc/$pid/comm contains the first 15 chars + an ending \n
str=$(echo -n $*|tr ' ' '\n'|sed -e 's/\(.\{1,15\}\).*/^\1$/'| tr '\n' '|')
str=$(grnc -nE "$str" /proc/[1-9]*/comm 2>/dev/null | cut -d/ -f3)
echo $str | grnc .
}
It can be a replace of pgrep/pidof and can use regular expression like these:
redfishos:~ # comw_pid yamui
623
redfishos:~ # comw_pid 'yamui.*'
619 623 703
redfishos:~ # comw_pid '.*sh'
13900 21934 21935
It is much more faster than using busybox pidof and here there is a
practical example:
redfishos:~ # comw_pid '[a-z]*sh' 'yamui.*' | time cat
13900 23006 23014 23015 619 623 703
real 0m 0.13s
redfishos:~ # time pidof bash ash sh zsh csh dash yamui
13900 13899 11319 722 721 658 1 623
real 0m 0.62s
Searching for every shell plus a process of your own, can be
considered something real and not a corner case like querying 100
process names.
Best regards, R-
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