U

Index

u command
ed text editor,
vi text editor,
U command, vi text editor,
-U command (RPMs),
UART,
UDP (User Datagram Protocol), TCP/IP and,
UID field, /etc/passwd file,
umask command, default file permissions, setting,
UMSDOS-HOWTO file,
uname (GNU shell utility), description,
unauthorized access (security threats),
unexpand (GNU text utility),
Unicode-HOWTO file,
uniq (GNU text utility),
UNIX
origins,
printers (LPD),
Unix-Internet-Fundamentals-HOWTO file,
unless statement, Perl,
unmount command, CD-ROMs,
updates, operating system, security considerations,
updates command,
updating, packages,
upgrade option, kickstart,
upgrades
installation,
security considerations,
system administration and, ,
upgrading
kernel,
RPMs for,
Red Hat Network, registering with,
RPMs,
UPS-HOWTO file,
uptime command,
URLs (Uniform Resource Locators)
directory paths, ,
domain name,
file:// protocol,
filenames,
ftp:// protocol,
HTML anchor,
http:// protocol,
https:// protocol,
hypertext,
links,
mailto:// protocol,
news:// protocol,
port address,
protocol,
telnet:// protocol,
USB
kernel configuration,
modem support,
USB-Digital-Camera-HOWTO file,
Usenet
definition,
Google and,
Usenet-News-HOWTO file,
user command, FTP,
user database, sendmail,
user ID. See , checking for
user ID mapping options (/etc/exports file),
useradd command, user accounts,
User-Authentication-HOWTO file,
/user/bin/switchdesk utility, switching from GNOME to KDE,
User-Group-HOWTO file,
username field, /etc/passwd file,
users
adding/removing, , ,
management commands,
system settings,
users (GNU shell utility), description,
/usr
description,
subdirectories,
UTC (Universal Coordinated Time),
utilities
CD-ROM with book,
GNU,
GNU bc,
gzip,
patch,
sed,
gprof (profiling),
make,
redhat-config-xfree86,
stylesheets
xmllint,
xsltproc,
system administration and,
UUCP (UNIX-to-UNIX Copy Protocol), newsgroups and,
UUCP-HOWTO file,