How to find ppid processes children with ps

[warburp]

Hi

I'm trying to write a script to display all processes with a ppid that I am holding in an array. Can anyone suggest what ps command should be used. My current code is below:

while (( i < ${NUMPIDS} )) #while the array count < i
do
if [ i -eq 0 ] #set the header with pid 0
then
echo &quot;\t \t`ps -p 999999999999999999 -o pid,user,time,args`\n&quot; # set up header
((i+=1))
fi

echo &quot;\t $i -- \t`ps -p ${pidarray} -o pid,user,time,args|tail -1`\n&quot;
((i+=1))

done

Thanks

 

[aigles]

Try :

set -A pidarray 54562 56588 52880 54326 # for example

ps -p &quot;${pidarray[*]}&quot; -o pid,user,time,args|awk '{print &quot;\t&quot;$0}'


Jean Pierre.

 

[warburp]

Thanks Jean Pierre, but I don't think I have explained it correctly.
I have a pid in an array and I want to find the pids of all other processes with a parent pid (ppid) = pid in the array (i.e. find all the child processes)

Thanks

 

[PHV]

Try something like this:

echo "\t\t`ps -p 99999999 -o pid,user,time,args`\n"
i=1
while (( i < ${NUMPIDS} )); do
 ppid=${pidarray[i]}
 echo &quot;\t $i --\t`ps -p $ppid -o pid,user,time,args|tail -1`&quot;
 ps -e -o ppid,pid,user,time,args | awk '
  $1=='$ppid'{sub(&quot;[1-9][0-9]*&quot;,&quot;\t\t&quot;);print}'
  echo
 ((i+=1))
done

Hope This Help
PH.

 

[aigles]

The following code print all processes with their parent pid in the array &quot;pidarray&quot; (don't need pid 0 for header) :

set -A pidarray 1 2630

ps -e -o ppid,pid,user,time,args | awk -v Ppids=&quot;${pidarray[*]}&quot; '
function PrintProcess( ,infos) {
gsub(&quot;^ *[^ ]+&quot;,&quot;&quot ;
print &quot;\t&quot; $0 ;
}
BEGIN {
gsub(&quot;^ *| *$&quot;,&quot;&quot;, Ppids) ;
gsub(&quot; +&quot;, &quot;|&quot;, Ppids) ;
pattern = &quot;^ *(&quot; Ppids &quot$&quot; ;
}
NR==1 {
PrintProcess() ;
next ;
}
$1 ~ pattern {
PrintProcess() ;
}
'


Jean Pierre.

 

[SamBones]

A better way to find child processes is with [tt]ptree[/tt]. This command will show all processes in a process tree, including parent and all children.

    ptree $PID

Hope this helps.