Here are a few useful commands for system administration in Linux:
last : to show you the people who have logged into the computer today and the terminals they are/were using.
df -h: to show the utilization of the hard-drive capacity.
du -h: to show the size of a file, or a directory (including all sub-directories).
free: to show how much RAM memory you have free on your system.
top: to show all active processes that are running in the system, and the resource they are hogging (cpu, memory)
ps: to show a list of processes running on the system.
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