A-C
Access Control Lists (ACLs)
Access Control Lists (ACLs) provide an additional layer of access control to files and directories; associated with the
setfacl and
getfacl commands.
A protocol that maps an IP address to the hardware address on a network card.
anacron
The anacron service is designed to run
cron jobs that could not run while a server was powered down.
The Apache Web server provides both normal and secure Web services, controlled by the httpd daemon.
apachectl
The
apachectl command is the preferred method to start and stop an Apache server.
The arp command is used to view or modify the kernel's ARP table. Using arp, you can detect problems such as duplicate addresses on the network. Alternatively, you can use arp to add the required entries from your LAN.
at
The
at command is similar to
cron, but it allows you to run a job on a one-time basis.
The way Linux checks the login rights of a user. Linux and Unix users are normally authenticated through use of a username and password, checked against /etc/passwd and related files.
automounter
The automounter can be configured to mount local and network directories on an as-needed basis. It's configured in /etc/auto.master, /etc/auto.misc, /etc/auto.smb, and /etc/auto.net.
BIND (Berkeley Internet Name Domain)
BIND is the Unix/Linux software that is used to set up a Domain Name System (DNS) service. The associated daemon is named.
BIOS
The BIOS is the Basic Input/Output System that runs basic commands when you power up your computer. The BIOS menu allows you to customize many options, including the sequence of boot media.
/boot
The directory with the main files required to boot Linux, including the Linux kernel and initial RAM disk. By default, /boot is mounted on a separate partition.
BOOTP
A TCP/IP protocol that sends IP address information from a remote DHCP server.
caching-only name server
A caching-only name server that 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.
The
chattr command allows you to change file attributes.
The
chgrp command changes the group that owns a file.
The
chkconfig command manages runlevel service information. It can activate or deactivate services. It can also customize services at specific runlevels.
The
chmod command changes the permissions on a file.
The
chown command changes ownership on a file.
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.
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 that 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 is the default print service for RHEL.
