Index

U

umount command, 587–588

uninstalling, software packages, 56

Unix, 4

history of, 10–11

unset, 154

unsolicited commercial mail, 451–452

unsupported drivers, 63–64

updating, 52–54

URL addresses, 254–256

usenet newsgroups, 20, 247–252

user accounts, 34, 37–38

configuring, 48–50

user interfaces, 10

user-defined chains, 334

users

absolute permissions, 538–539

adding and removing, 529–530

configuration files, 523–524

controlling passwords, 527–528

directory permissions, 539–540

/etc/login.access, 527

/etc/login.defs, 527

/etc/skel, 526–527

managing groups, 531–533

ownership, 534–536

ownership permissions, 540–541

password files, 524–526

permission defaults, 541–542

permission symbols, 537

permissions, 533–534, 535

profile scripts, 526

sticky bit permission, 540–541

/usr directories, 573

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