Linux in a Nutshell, Fifth Edition

size | 425

Linux

Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

-x, --exact

Shred the exact file size; do not round up to the next full

block.

-z, --zero

On the final pass, overwrite with zeros to hide the shredding.

shutdown

shutdown [options] when [message]

System administration command. Terminate all processing. when

may be a specific time (in hh:mm format), a number of minutes to

wait (in +m format), or now. A broadcast message notifies all users

to log off the system. Processes are signaled with SIGTERM to

allow them to exit gracefully. /etc/init is called to perform the actual

shutdown, which consists of placing the system in runlevel 1. Only

privileged users can execute the shutdown command, although init

may call shutdown with root privileges when the Ctrl-Alt-Del key

combination is pressed from the console keyboard. Broadcast

messages, default or defined, are displayed at regular intervals

during the grace period; the closer the shutdown time, the more

frequent the message.

Options

-a When called from init, shut down only if one of the users

listed in the file /etc/shutdown.allow is currently logged in.

-c Cancel a shutdown that is in progress.

-f Reboot fast, by suppressing the normal call to fsck when

rebooting.

-F Force a filesystem check (fsck) on reboot.

-h Halt the system when shutdown is complete.

-k Print the warning ...