unshielded twisted pair (UTP) cable, 363
Unstructured Query Language (UnQL), 539 – 540
until statements, 280 – 281
updating. See also software management
snaps, 122
Ubuntu, 11
from command line, 13 – 14 , 114 – 117
notifications about, 35
with Software Updater, 12 – 13 , 113Upstart, 289 – 290 , 292 , 297 – 298 , 473
uptime command, 306
uquick command, 665
USB drives
for backups, 328 – 329
installing from, 3 , 6use command, 534
Usenet newsgroups, 59 – 61
user accounts. See also group accounts
creating, 154 – 155
explained, 128 – 129 , 217 – 218
Fetchmail, 599 – 600
management, 223 – 224
adding new users, 225 – 228
disk quotas, 239 – 241 , 307
granting root privileges temporarily, 234 – 239
locking out, 225
monitoring activity, 228 – 229
naming conventions, 228
passwords. See passwords