Commands

Commands

arch

This command outputs the machine architecture. Output is along the lines of "i386", "i486", "i586", "i686", "alpha", "sparc", "arm", "m68k"

Example: This command has no options:

arch

hostname

[NAME]

If there are no arguments, hostname displays the name of the current host system. Otherwise, it sets the hostname as specified or displays the specified information.

Example: To set your system name to "odin", use

hostname odin

-a, --alias

Show alias name of the host.

-d, --domain

Display DNS domain name.

-F, --file filename

Read hostname from specified file, rather than /etc/hosts.

-f, --fqdn, --long

Display fully qualified domain name.

-h, --help

Display help message.

-i, --ip-address

Display host's IP address.

-s, --short

Display short host name.

-V, --version

Display version information.

-v, --verbose

Display verbose output.

-y, --yp, --nis

Display NIS domain name.

hwclock

--show

hwclock

--set --date=newdate

hwclock

--systohc

hwclock

--hctosys

hwclock

--getepoch

hwclock

--setepoch --epoch=year

hwclock

--adjust

hwclock

--version

This command displays or sets the values of the hardware clock. Note that this value is distinct from system time. The hardware clock is entirely independent from software, whereas the system time is mediated by a system interrupt.

Example: To display the time as understood by your hardware clock, use

hwclock --show

Example: To set the time on your hardware clock to 2 a.m. on the fourth of July, use

hwclock --set --date="07/04/01 02:00:00"

It is required that you invoke hwclock with one of the following options:

--show

Display time to standard output.

--set

Set the clock to the time specified at the --date option.

--hctosys

Set the system time from the hardware clock.

--systohc

Set the hardware clock from the system time.

--adjust

Adjust the hardware clock time.

--getepoch

Display the hardware clock's epoch value. (The epoch value is the number of years since 0 a.d. to which a value of 0 in the hardware clock would refer.)

--setepoch

Set the hardware clock's epoch value to the specified value.

--version

Display the version of hwclock to standard output.

The following commands are optional:

--date=date_string

Specify the time to set the hardware clock (e.g., hwclock --set --date="06/27/99 10:15:09").

--epoch=year

Specify the value for the epoch year.

--utc

Tell hwclock to keep itself in coordinated universal time.

--directisa

Tell hwclock to use explicit I/O instructions to access the hardware clock (on an ISA machine).

--test

Do everything, except actually update the hwclock.

--debug

Display debug information.

uname

[OPTION]

This command displays information about the machine and operating system to standard output. Some or all of the following information is displayed:

system name, node name, release, operating system version, machine

Example: To display information about your operating system release, use

uname -r

Example: To display verbose information (OS type, machine name, OS version, hardware platform, some other stuff) about your machine, use

uname -a

-a, --all

Display all the possible information.

-m, --machine

Display the hardware type.

-n, --nodename

Display the network node hostname.

-p, --processor

Display the processor type.

-r, --release

Display the operating system version.

-s, --sysname

Display the operating system name.

-v

Display the operating system version.

 



Linux Desk Reference
Linux Desk Reference (2nd Edition)
ISBN: 0130619892
EAN: 2147483647
Year: 2000
Pages: 174
Authors: Scott Hawkins

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