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UDMA (ultra direct memory access) modes
UDP (User Datagram Protocol) 2nd
UFS (Unix Filesystem) 2nd
UIDs (user IDs) 2nd
ultra direct memory access (UDMA) modes
umount command 2nd 3rd 4th
unalias command
unencrypted wireless connectivity
UNIX
     design philosophy
     history of
     installation floppies, creating
     kernel panics
     newsgroups
     Unix Filesystem
UNKNOWN firewall type
unloading kernel modules
unmounting
    filesystems
         CD-ROMs
         floppy disks
         FreeBSD
         other removable media
     hard disks
unset command
unshielded twisted-pair (UTP) cables
unshift() operator
until loops 2nd
ip-up scripts
UPDATE command (SQL)
updates [See also upgrades.]
     ports
         CVSup
         forbidden ports
     rows
     Soft Updates 2nd
UPDATING text files
upgrades [See also updates.]
     active lines of development, upgrading to
     binary upgrades
    FreeBSD sources
         CURRENT source branch
         STABLE source branch
         tracking
     interim builds, upgrading to
     make world upgrades
         /etc/group and /etc/passwd, merging
         /etc/make.conf, merging
         /usr/obj, cleaning out
         cautions
         custom kernels, upgrading
         GENERIC kernels, upgrading
         mailing lists
         make buildworld command
         make installworld command
         mergemaster command
         output logs, creating
         preparation
         source synchronization with CVSup
         table of compilation steps
         troubleshooting
         UPDATING text files
     packages
     ports
         portinstall
         Portupgrade
     rebooting after
     release versions, upgrading to
     upgrade targets, selecting
uplink ports
uptime
USB devices
Usenet newsgroups
     FreeBSD-related resources
     FreeBSD-specific resources
User Commands section (online manuals)
User Datagram Protocol (UDP) 2nd
User field (/etc/ftphosts)
user IDs (UIDs) 2nd
user PPP 2nd
user-level access control (Samba)
user-management commands
usernames
     configuration
     mapping
users [See also groups.]
     /etc/master.passwd file
     /etc/passwd file
     ACLs (Access Control Lists) 2nd
         adding users/groups to
         current settings, viewing
         deleting entries from
         denying access with
         kernel support, configuring
         maximum permissions masks
         enabling on mounted filesystems
         UFS1 filesystem support
     adding to groups
     adding to system
         adduser
         home directories
         group membership
         Login IDs
         names
         passwords
         login shells
         UIDs
     automated users
     file ownership
         changing
         group ownership
         listing
     file/directory permissions
         capabilities granted by
         changing
    interacting with
         command substitution
         command-line arguments
         STDIN, reading input from
     login users
     managing with NIS (Network Information Service)
     regular users
     removing 2nd
     super-users
     UIDs (user IDs) 2nd
     user-management commands
     usernames
         configuration
         mapping
     wheel users
UTP (unshielded twisted-pair) cables
uudecode
uuencode