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Listing different information

If you want to list different types of information to check who is logged in to your system, use eo option. Where e show all the processes and o controls the output.

Syntax:

Example:

ps -eo pid,user

Look at the above snapshot, it displays process ID and user name as mentioned in the argument.

Example:

ps -eo pid,user,ppid,args

Look at the above snapshot, it displays process ID, user name, parent PID and args.