pwd
Print working directory, i.e., display the name of my current directory on the screen.
hostname
Print the name of the local host (the machine on which you are working). Use netconf (as root) to change the name of the machine.
whoami
Print my login name.
id username
Print user id (uid) and his/her group id (gid), effective id (if different than the real id) and the
Common Linux commands on system info
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Oleh
Admin