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UDP (User Datagram Protocol) versus TCP (Transmission Control Protocol), 125
UHCI (Universal Host Controller Interface), usage with USB controllers, 309-310
uninstalled packages, querying with RPM, 60-61. See also installed packages, packages
Unix
history of, 3-4
resource for history of, 14
as trademark, 5
versions of, 4
UNIX FAQ, locating, 14
Unix flavors, tracing with init program, 42-43
up2date program
versus apt-get program, 145, 150
explanation of, 68
update-inetd program, using with Debian GNU/Linux, 168
update-rc.d tool, using with Debian GNU/Linux, 158-159
upgradepkg command, using with Slackware Linux, 109
USB devices
core framework of, 309
device-specific drivers for, 310
digital cameras used with, 310-311
flash card readers used with, 311
kernel hotplug for, 310
MP3 players used with, 312
USB Host controller driver for, 309-310
USB host controller driver, explanation of, 309-310
user libraries, configuring software with, 184-185
user parameter of xinetd configuration file, role in CVS and Red Hat Linux installation, 270-271
/usr directory
Red Hat comments about, 70-71
separation from root directories, 40
typical contents of, 39
/usr/local directory
installing software into, 178
versus /opt directory, 179
Red Hat comments about, 70
/usr/local/etc directory, contents of, 37
/usr/local/java script example, 345-346
/usr/src/linux-2.4 symbolic link, explanation of, 95
/usr/src/redhat directory, using as software installation tool, 189-190
util-linux core library package, usage with Red Hat Linux 7/3, 85
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