C

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caching-only name server

A caching-only name server performs many of the functions of a DNS server. It stores the IP address associated with recent name searches, for use by other computers on your LAN.

chage

The chage command manages the expiration date of a password.

chains

Chains are iptables (or ipchains) commands that are linked together. These are linked rules that are applied to each network packet that passes through a Linux firewall computer. iptables is the standard for RHEL 3.

chgrp

The chgrp command changes the group that owns a file.

chkconfig

The chkconfig command manages runlevel service information. It can activate or deactivate services. It can also customize services at specific runlevels.

chmod

The chmod command changes the permissions on a file.

chown

The chown command changes ownership on a file.

CIFS (Common Internet File System)

CIFS is the Microsoft name for advances in its networking software. It's also covered by the latest version of Samba, 3.0, which is included with RHEL 3.

client

A client is a computer that accesses information or resources from a server.

CNAME (canonical name)

The CNAME is a way to assign several different names to a computer in a DNS database. For example, you can set up www as an alias for the computer with your Web server. CNAME records cannot be assigned to a mail server (MX) or a Start of Authority (SOA) record.

cron

A service which runs jobs on a periodic basis. It's configured in /etc/crontab; by default, it executes jobs in the /etc/cron.hourly, /etc/cron.daily, /etc/cron.weekly, and /etc/cron.monthly directories.

crontab

Individual users can run the crontab command to configure jobs that are run periodically.

CUPS (Common Unix Printing System)

CUPS is the default print service for RHEL 3.

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