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Linux in a Nutshell, 6th Edition by Robert Love, Stephen Figgins, Ellen Siever, Arnold Robbins

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System Status

Command

Action

at

Execute commands later.

atq

Show jobs queued by at.

atrm

Remove job queued by at.

crontab

Automate commands.

date

Display or set date.

df

Show free disk space.

du

Show disk usage.

env

Show environment variables.

finger

Display information about users.

free

Show free and used memory.

hostname

Display the system’s hostname.

kill

Terminate a running command.

printenv

Show environment variables.

ps

Show processes.

quota

Display disk usage and limits.

stat

Display file or filesystem status.

stty

Set or display terminal settings.

top

Display tasks currently running.

tty

Display filename of the terminal connected to standard input.

uname

Display system information.

uptime

Show how long the system has been running.

vmstat

Show virtual memory statistics.

who

Show who is logged in.

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