Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

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

-h, --help

Display a help message and then exit.

-i, --ip-address

Display the IP address(es) of the host.

-n, --node

Display or set the DECnet node name.

-s, --short

Trim domain information from the display output.

-v, --verbose

Verbose mode.

-V, --version

Display version information and then exit.

-y, --yp, --nis

Display the NIS domain name. A privileged user can set a new

NIS domain name with nameofhost.

htdigest

htdigest [-c] filename realm username

Create or update user authentication files used by the Apache web

server. The -c option is used if you wish to create the file, and will

overwrite any existing files rather than update them. The three

arguments are the file you wish to use as the authentication file, the

realm name to which the user belongs, and the username you will

update in the password file. You will be prompted for a password

when you run the command.

The Apache manual contains information about authentication

mechanisms, including more detail about using htdigest and the

ways in which you can control access to the resources served by

Apache.

hwclock

hwclock [option]

System administration command. Read or set the hardware clock.

This command maintains change information in /etc/adjtime,

which can be used to adjust the clock based on how much it drifts ...