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UBE (unsolicited bulk email) controls for Postfix
     basic configurations
UDF (Universal Disk Format) filesystem standard
UID (user identification)
     batch change of file ownership using
     changing without affecting login name
umask
umount command
     Òdevice is busyÓ error
uname command 2nd
uninstalling source built programs
update command
     working files in a shared project
update-rc.d command
URLs (Uniform Resource Locators)
     this book
USB devices, listing
uscpi-tcp
Usenet groups
     hardware
useradd command 2nd
     performance in scripts
     system users, creating with
userdel command
UserDir-type web sites 2nd
     password-protecting
usermod command
users, managing
     adding users
     batch addition of new users
     batch addition of users to groups
     deleting users
     disabling accounts
         re-enabling
     disk quotas
     granting of root permissions
     group members, adding and deleting
     groups, adding
     groups, deleting
     killing user processes
     password management
     passwords, changing en masse
     sorting human from system users
     system groups, creating
     system users, creating
     user accounts, modifying
         owned files outside the home directory
         potential impacts
     user's UID and GID, finding
/usr/source/linux and kernel sources
usrquota partition

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