merge two lines - parent+child processes

[w5000]

hello,

on the output of:
ps -uauser -e -o pid,ppid,args

I can extract lines like (it is example):
17531 11234 bcommand options .....
17803 17802 /bin/bash ascript .....
17871 17803 acommand options .....
11234 17755 /bin/bash bscript .....
etc...

and I want to search for pairs of processes (parent+child, so lines for which pid in one line == ppid in second one) and join them in one line to get finally output - example basing on above input:
17803 17802 /bin/bash ascript ..... acommand options .....
11234 17755 /bin/bash bscript ..... bcommand options .....

thank you for any hint

 

[skillaci]

See if this awk command will work for you:

awk '{c[$2]++;l=$0;gsub("^[0-9]+ *[0-9]+ *","",l);pid[$1]=l;ppid[$2]=(ppid[$2]?ppid[$2] " " l : l)}END{for(i in ppid) if (i in pid) {pid[i] = pid[i]" "ppid[i];print i, pid[i]}}' file