equivalent of ptree command in zsh

Shell Programming and Scripting
1

ptree command is not working in zsh. Could anyone let me know the equivalent of ptree command in zsh.

2

'ptree' is not a shell built-in - it should work regardless of the calling shell.
pls define the 'not working in zsh' statement.

3

when i tree ptree command with a PID, i am getting the command not found. Please find below the same.

<lnx30:data/serial>$ ps -ef | grep LMPE
lmp 21974 21963 0 17:05 ? 00:00:00 /bin/ksh /lmp/prod/bin/LMPExecuteGrpDriver.sh 4
lmp 21995 21974 0 17:05 ? 00:00:00 /bin/ksh /lmp/prod/bin/LMPExecuteGrpDriver.sh 4
lmp 22130 21974 0 17:06 ? 00:00:00 /bin/ksh /lmp/prod/bin/LMPExecuteGrpDriver.sh 4
ap90 30951 20826 0 18:00 pts/3 00:00:00 grep LMPE
<lnx30:data/serial>$ ptree 21995
zsh: command not found: ptree

4

Most probably that is down to the environment "PATH" being different in different shells.