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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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halt [options]

System administration command: turns off the computer. Insert a note in the file /var/log/wtmp; if the system is in runlevel 0 or 6, stop all processes; otherwise, call shutdown -h.



Suppress writing to /var/log/wtmp.


Call halt even when shutdown -nf would normally be called (i.e., force a call to halt, even when not in runlevel 0 or 6).


Place hard drives in standby mode before halt or power off.


Shut down network interfaces before halt.


No sync before reboot or halt.


Perform power-off when halting system.


Suppress normal call to sync.


Suppress normal execution; simply write to /var/log/wtmp.

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