Question

Unix bash script:

I know you use the top command but else do you have to do? Please Explain.

Show a real-time view of system information, such as CPU usage, memory usage, etc., and the processes using the most CPU, memory and time.

Show a real-time view of system information, such as CPU usage, memory usage, etc., and just your processes using the most CPU, memory and time.

Answer 1

Q. Show a real-time view of system information, such as CPU usage, memory usage, etc., and the processes using the most CPU, memory and time.

A. No need to use any other filter/option from top command, as its default options let you see all these data in real-time view.

Just use top command in bash shell and you’ll have your required answer.

Below image is having no filter/option , just top command

Q. Show a real-time view of system information, such as CPU usage, memory usage, etc., and just your processes using the most CPU, memory and time.

A. For this you need to use one of the option/filter of the top command and that is -u (hyphen u) . If that user’s not present , it’ll throw error Invalid user and exit

command : top -u <user’s name>

example : top -u HomeworkLib

Below image is having specific user and option 'i'

While using top command you can use following options as well to sort more:

1. ‘i’ --> this option will first remove the idle processes from the top’s output , if pressed again , you can have your default top’s command output

command : top -i (this will also work)

2. ‘P’ --> this option will let you sort by CPU Usage

3. ‘d’ --> this option will let you decide how much delay in seonds you want between two consecutive outputs of top command. By default its set to 5 seconds.

Command : top -d <second>