Explain the difference between PID and PPID with example.

A collection of system programs and user generated programs is called Process.

- Every process contains two ID’s.

PID – Process ID

Syntax: 

$ ps [-efc] -ef – full information about executed process -c – process schedule information

PPID – Parent processs ID

Example:

ps –ef Output: root 12066 12036 19:44 pts/2 Here, 12066 is PID and 12036 is Parent Process ID.