In this article we will discuss, how to differentiate and identify each process in linux.

Process ID

Each process in Linux has a unique id and has a parent.  We can get the process id of a running process and its parent’s process id using following functions,

File to be included for them is <unistd.h>

Let’s see an example,

Output

Process ID : 3825
Parent Process ID : 3560

To check the process id and parent process id of all running process, use following command,

Output will contains many rows with following columns i.e

UID PID PPID C STIME TTY TIME CMD
varun 3223 1880 0 23:10 ? 00:00:02 /usr/lib/chromium-browser/chro
varun 3250 1880 0 23:10 ? 00:00:01 /usr/lib/chromium-browser/chro

 

Here PID represents process id and PPID represents Parent Process Id

What is an Orphan Process

Every process has a parent process.
If a parent process terminates then all its children process become orphan processes. As soon as a process becomes orphan, the init process becomes their parent.

Process ID of init process is 1.

Python Recommendations:

C++ & C++11 Recommendations:

If you didn't find what you were looking, then do suggest us in the comments below. We will be more than happy to add that.

Do Subscribe with us for more Articles / Tutorials like this,