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I have a question pertaining the 'top' command and dissecting it. What I mean by that is say for instance I wanted to display only particular parameters while top is running live, I want to only display the following parameters:

The current time, CPU utilization, current memory utilization, current disk space utilization, and currently logged in users, what would I do to do so?

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Different systems have different top implementations, but in general it isn't very configurable. It's meant to show information about memory and CPU usage; disk space and logged-in users are not its job. Conversely, not showing lists of processes isn't its job either.

If you want a configurable system monitor, try conky. It's GUI-based. Or nagios's web-based dashboards.

If you want to display information of your choice in a terminal, you can use the watch command to run a program every few seconds. Pass it a shell script that displays the information you want. For example:

watch ./my-favorite-statistics

with my-favorite-statistics containing something like

#!/bin/sh
vmstat
df
who

For the CPU and memory part, you may want something nicer than vmstat. Linux's free might help for memory, or you can massage the output of vmstat.

  • This is excellent Gilles, you have put me towards the correct direction. I will definitely try some of the mentioned ideas. Thanks a ton! – Linuxn00b Dec 5 '15 at 21:13

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