Show all Running Processes in Linux

PS because of historical reasons, so very peculiar, some commands must add "-", such as:

PS A

The above notation is wrong.

Simple selection ********* ********* selection by list *********-a All processes-C by command name-N Negate Selection-G by Real Group ID (supports names)-A AllW/TTY except session leaders-U by Real user ID (supports names)-D All except session leaders-g by session OR by effective group name-E All Processes-p by Process IDT all processes in this terminal-S processesinchThe sessions Givena allW/TTY, including other users-T by Ttyg OBSOLETE--Don't use-u by effective user ID (supports names) r only running processes U processes forSpecified USERSX processesW/o controlling TTYs t by TTYOutput Format ********** ***********LongOptions ***********-o,o user-defined-f full--group--user--pid--cols--Ppid-j,j job Control s signal--group--user--sid--rows--Info-o,o preloaded-o v virtual memory--cumulative--format--deselect-l,lLongU user-oriented--Sort--tty--forest--version-F Extra Full X registers--heading--no-heading--ContextMisc Options *********-v,v Show version L list format codes F ASCII Art Forest-m,m,-l,-t,h Threads S Childreninch sum-Y Change-l Format-m,z Security Data CtrueCommand name-C Scheduling Class-W,WWide output n Numeric Wchan,uid-H process Hierarchy[[email protected] smplayer]$PSaerror:unsupported option (BSD syntax)Simple selection ********* ********* selection by list *********-a All processes-C by command name-N Negate Selection-G by Real Group ID (supports names)-A AllW/TTY except session leaders-U by Real user ID (supports names)-D All except session leaders-g by session OR by effective group name-E All Processes-p by Process IDT all processes in this terminal-S processesinchThe sessions Givena allW/TTY, including other users-T by Ttyg OBSOLETE--Don't use-u by effective user ID (supports names) r only running processes U processes forSpecified USERSX processesW/o controlling TTYs t by TTYOutput Format ********** ***********LongOptions ***********-o,o user-defined-f full--group--user--pid--cols--Ppid-j,j job Control s signal--group--user--sid--rows--Info-o,o preloaded-o v virtual memory--cumulative--format--deselect-l,lLongU user-oriented--Sort--tty--forest--version-F Extra Full X registers--heading--no-heading--ContextMisc Options *********-v,v Show version L list format codes F ASCII Art Forest-m,m,-l,-t,h Threads S Childreninch sum-Y Change-l Format-m,z Security Data CtrueCommand name-C Scheduling Class-W,WWide output n numeric wchan,uid-h process hierarchy

how do I See all running process in Linux operating systems using command Line or GUI options?

Need to use the PS command. It provide information about the currently running processes, including their process identification numbers (PIDS). Both Linux and UNIX support for the PS command to display information the running process. The PS command gives a snapshot of the current processes. If you want a repetitive update of the This status, use top, atop, and/or Htop command as described below.

Tutorial Details
Difficulty	Easy (RSS)
Root Privileges	Yes
Requirements	Ps/top/htop
Estimated completion time	5 minutes

Apart from PS command, you can also with the following commands to display info about processes on Linux:

1. topCommand:display and update sorted information about processes.
2. atop: Advanced System & Process Monitor.
3. htop: Interactive Process Viewer.

The PS command

Type the following PS command to display all running process:

PS  Less

Where,

• -a:select All Processes
• A:select all processes on a terminal, including those of other users
• X:select processes without controlling ttys

Task:see every process on the system

PS -PS -E

The above two commands are the same.

Task:see every process except those running as root

PS -u root-u root-n

PS -u maijunjin| grep su 3640 pts/2    xx:xx:su23654 pts/2 XX: xx    sups -u maijunjin| grep su

Task:see process run by user Vivek

PS -u Vivek

Task:top command

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

# Top

Output:

Fig.01:top Command:display Linux Tasks

To quit press Q, for help press H.

Task:display a tree of processes

Pstree 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, the all process trees rooted at processes owned by, the user is shown.

$ pstree

Sample outputs:

Fig.02:pstree-display a tree of processes

Task:print a process tree using PS

PS -PS AXJF

Task:get info about Threads

Type the following command:

PS -PS AXJF

Task:get info about Threads

Type the following command:

Show all Running Processes in Linux