11-09-2006
BOFH is correct, however, depending on your needs there may be a different set of "most essential commands" My example :
dig, traceroute, ping, whois, mail, ssh, ps, grep, perl, vi.
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LEARN ABOUT CENTOS
whois.conf
WHOIS.CONF(5) Debian GNU/Linux WHOIS.CONF(5)
NAME
whois.conf - alternative WHOIS servers list for whois client
SYNOPSIS
/etc/whois.conf
DESCRIPTION
This file contains a list of WHOIS servers which can augment or override the built-in list of the client.
It's a plain text file in ASCII encoding. Each line consists of two fields: a pattern to match WHOIS object identifier and a corresponding
WHOIS server domain name.
Fields are separated by non-empty sequence of space or a tabular characters. A line starting with a hash character is a free comment and
it's not considered.
The pattern is case-insensitive extended regular expression if whois client has been compiled with POSIX regular expressions support. Oth-
erwise, simple case-insensitive suffix comparison against WHOIS object identifier is used.
Internationalized domain names (IDN) must be specified in ascii-compatible encoding (ACE) format.
EXAMPLE
.nz$ nz.whois-servers.net
# Hangul Korean TLD
.xn--3e0b707e$ whois.kr
# Private ASNs
^as645(1[2-9]|2[0-9]|3[0-4])$ whois.example.net
FILES
/etc/whois.conf
SEE ALSO
whois(1)
AUTHOR
This manual page was written by Petr Pisa <ppisar@redhat.com> and is licensed under the terms of the GNU General Public License, version 2
or higher.
Petr Pisa 9 April 2013 WHOIS.CONF(5)