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To get all child process in a tree format, you can run the below

$ ps -g 24154 --forest PID TTY TIME CMD 24154 pts/4 00:00:00 bash 25745 pts/4 00:00:00 \_ ps

How can I get the below o/p for a PID? Below is the partial o/p of ps -ef --forest | less for a PID 24154.

root 1173 1 0 Sep07 ? 00:00:00 /usr/sbin/sshd -D root 24141 1173 0 11:10 ? 00:00:00 \_ sshd: vishwa [priv] vishwa 24149 24141 0 11:10 ? 00:00:00 | \_ sshd: vishwa@pts/4 vishwa 24154 24149 0 11:10 pts/4 00:00:00 | \_ -bash vishwa 26004 24154 0 11:22 pts/4 00:00:00 | \_ ps -ef --forest vishwa 26005 24154 0 11:22 pts/4 00:00:00 | \_ less
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You can get the process name and PID starting from the init process by running

$ pstree -ps $$ systemd(1)───sshd(1173)───sshd(42546)───sshd(42555)───bash(42560)───pstree(46455)

The below command worked as I did not have any child process running inside bash. If there are multiple jobs running inside the shell, you will not see the intended results

$ ps -ef --forest | grep -B3 $$ root 1173 1 0 Sep07 ? 00:00:00 /usr/sbin/sshd -D root 42546 1173 0 20:44 ? 00:00:00 \_ sshd: vishwa [priv] vishwa 42555 42546 0 20:44 ? 00:00:00 | \_ sshd: vishwa@pts/3 vishwa 42560 42555 0 20:44 pts/3 00:00:00 | \_ -bash vishwa 46522 42560 0 21:13 pts/3 00:00:00 | \_ ps -ef --forest vishwa 46523 42560 0 21:13 pts/3 00:00:00 | \_ grep --color=auto -B3 42560

$$ here is the PID of the current shell, type echo $$ to output the PID.

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