Analyzing Processes, Memory and CPU

Question 1

How to display all the running processes on the system?

Answer 1

ps -a

Question 2

How to display the processes running in the current shell?

Answer 2

ps

Question 3

How to run ps for a specific user?

Answer 3

ps -u {username}

Question 4

What is the TIME value from the ps -axjf command?

Answer 4

cumulative CPU time the process has used

Question 5

What is the COMMAND value from the ps -axjf command?

Answer 5

the command used to start the process

Question 6

What is the UID (User ID) value from the ps -axjf command?

Answer 6

numeric user ID of the process owner

Question 7

What is the C (CPU Usage) value from the ps -axjf command?

Answer 7

scheduler priority of the task

Question 8

What is the TT (Terminal) value from the ps -axjf command?

Answer 8

terminal associated with the process

Question 9

What does ?? indicate for TT (Terminal)

Answer 9

processes are not attached to any terminal (they’re system or daemon processes)

Question 10

What is the meaning of the x parameter for the ps command?

Answer 10

• include processes that do not have a controlling terminal
• often includes daemon processes (services running in the background), which are important in system operation but not tied to a specific user terminal

Question 11

What is the meaning of the j parameter for the ps command?

Answer 11

• show additional columns related to job control
• adds columns for PGID (Process Group ID), SID (Session ID), and other related fields
• useful for seeing the relationship between processes, like which processes are grouped together