Shell Programming and Scripting

Dear experts,
I'm moving from SunOS to Linux.
Linux has no ptree, but it has pstree. Anyway, pstree doesn't show what ptree used to print with output nice to grep. My Linux distribution doesn't have proctree either.

This forum has few posts touching ptree/pstree topic, but I didn't find a nice solution for quick method getting list of all predecessors and successors for given PID.

The best I figured out for now is a two steps approach.
1: To get list of childs (and theirs childs), I use ‘ptree -Gap $$' command.
2: To get list of all predecessors, I use recursive approach using ps -p <PID> -o ppid looking for parent pid, until reaching 1.

I'm wondering if you know a simpler method.
Kind Regards
bzk

Look into the ps command.

Code:

ps -aef --forest

may be a starting point for you.

Thanks jim mcnamara.

--forest gives me all data I need, but also much more than I expected. So I would have to create some smart "grep" logic to drop all data I don't need.

Finally, I decided to use combined solution:
1. To have all tree down from some pid, use ptreee -Gap <PID> and use awk to get pids.
2. To have all tree up from some pid, use following logic:

Code:

_currentPid=<requested PID>
while (( _currentPid != 1 ))
do
    _ppid=""
    ps -p ${_currentPid} -o ppid= | read _ppid _junk         
    print ${_ppid}
    _currentPid=${_ppid}
done

Thanks and Regards
bzk