Linux in a Nutshell, Fifth Edition

hdparm | 201

Linux

Commands

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the original filename if present, and do not restore the original

timestamp if present. This option is the default when

decompressing.

-N, --name

Default. Save original name and timestamp. When decom-

pressing, restore original name and timestamp.

-q, --quiet

Print no warnings.

-r, --recursive

When given a directory as an argument, recursively compress

or decompress files within it.

-S suffix, --suffix suffix

Append .suffix. Default is gz. A null suffix while decom-

pressing causes gunzip to attempt to decompress all specified

files, regardless of suffix.

-t, --test

Test compressed file integrity.

-v, --verbose

Print name and percent size reduction for each file.

-V, --version

Display the version number and compilation options.

halt

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.

Options

-d Suppress writing to /var/log/wtmp.

-f 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).

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

-i Shut down network interfaces before halt.

-n No sync before reboot or halt.

-p Perform power-off when halting system.