Commands Line Utilities

Process

• Find PID of a known program.

pidof <application name>

• Find all the direct and indirect child processes of a process.

pstree -p <PID>

• List all the files opened by a process with PID.

lsof -p <PID>

• Find details of a file descriptor corresponding to a PID.

lsof -p <PID> -a -d <FD>

- -a => Stands for 'AND' Operation.

- -d => File descriptor for which we need to find details.

• Find Parent (PPID) of a process with PID.

= File System =
* Check filesystem type.
<pre>
df -T <Path>

• See details about a mount.

findmnt -T <Path>

ps -o ppid= -o comm= -p <PID>