)
profile Sets system-wide environment and startup programs for all users. This file is
read when the user logs in.
protocols Sets protocol numbers and names for a variety of Internet services.
resolv.conf Identifies the locations of DNS name server computers that are used by TCP/IP
to translate Internet host.domain names into IP addresses. (When a Web
browser or mail client looks for an Internet site, it checks servers listed in this
file to locate the site.)
rpc Defines remote procedure call names and numbers.
services Defines TCP/IP and UDP services and their port assignments.
shadow Contains encrypted passwords for users who are defined in the passwd file.
(This is viewed as a more secure way to store passwords than the original
encrypted password in the passwd file. The passwd file needs to be publicly
readable, whereas the shadow file can be unreadable by all but the root user.)
shells Lists the shell command-line interpreters (bash, sh, csh, and so on) that are
available on the system, as well as their locations.
sudoers Sets commands that can be run by users, who may not otherwise have
permission to run the command, using the sudo command. In particular, this
file is used to provide selected users with root permission.
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TABLE 4-1 (continued)
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