How to Show All Running Processes in Linux

How to Show All Running Processes in Linux :-

How to show all running process in Linux operating systems using command line or GUI options.

Linux commands to list processes :-

following commands to display info about processes on Linux:

top command : Display and update sorted information about processes.

atop command : Advanced System & Process Monitor.

htop command : Interactive process viewer.

pgrep command : Look up or signal processes based on name and other attributes.

pstree command : Display a tree of processes.

How to list process with the ps command :-

following ps command to display all running process:

# ps -aux | less

OR

# ps aux | less

Where,

A : Select all processes

u : Select all processes on a terminal, including those of other users

x : Select processes without controlling ttys

How To See every process on the Linux system :-

Either pass -A or -e option to show all processes on your server/workstation powered by Linux:

# ps -A

# ps -e

How to see every process except those running as root :-

To negates the selection pass the -N or --deselect option to the ps command:

# ps -U root -u root -N

OR

# ps -U root -u root --deselect

How to See process run by user xyz :-

Select by process by effective user ID (EUID) or name by passing username such as xyz:

# ps -u xyz

Linux running processes with top command :-

The top program provides a dynamic real-time view of a running system. Type the top at command prompt:

# top

How to display a tree of processes :-

The pstree command shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a user name is specified, all process trees rooted at processes owned by that user are shown.

$ pstree

Print a process tree using ps :-

# ps -ejH

# ps axjf

How to Get info about threads using following command :-

Type the following command:

# ps -eLf

# ps axms

How to show Task: Get security info :-

Type the following command:

# ps -eo euser,ruser,suser,fuser,f,comm,label

# ps axZ

# ps -eM

How to save process snapshot to a file :-

Type the following command:

# top -b -n1 > /tmp/process.log

Or you can email result to yourself : -

# top -b -n1 | mail -s 'Process snapshot' you@example.com

How to lookup process by name :-

Use pgrep command command. It looks through the currently running processes and lists the process IDs which matches the selection criteria to screen. For example, display firefox process id:

$ pgrep firefox

Sample outputs:

3356

Following command will list the process called sshd which is owned by a user called root:

$ pgrep -u root sshd