Index_U

U

UDP (Universal Datagram Protocol), 452

UID ( user identification number), 259

umask command, 176

umount program, 62

uncompiled source packages, 313, 314

unmounting

command line and, 62

up2date facility, 320, 321, 322, 323

Update System GUI, Package Management Tool, 296

updates

automating, 328

upgrade

versus new installation, 11

upgrades

packages, 311

RPM and, 292

uploads

FTP server

anonymous configuration, 366

uptime command

Perl, 561

USB devices

flash drives , 199

information detection, 71

user account database, 258

user accounts

creating, 32, 252, 253

credentials, 250

FTP server

disabling, 368, 369

groups, 254, 255, 262, 263

member management, 255, 256, 257

information storage, 257, 258, 259, 260, 261, 262, 263

passwords, 260

/etc/shadow file, 261, 262

encryption, 260

guessing, 260

properties, 258, 259, 260

purpose, 250

user management

root user, 83

User Manager, 251

account information storage, 257, 258, 259, 260, 261, 262, 263

creating accounts, 252, 253

creating groups, 254, 255

deleting users, 272

file locking, 263

groups, 262, 263

managing, 255, 256, 257

passwords, 260

/etc/shadow file, 261, 262

encryption, 260

guessing, 260

properties, 258, 259, 260

user-defined variables

command line syntax, 232

useradd command, 267

userinfo command, 269

users

/etc/default/useradd and, 488

account modification

root account and, 270, 271

adding, 85

adding at command line, 265, 266, 267

administrator, 250

command line tools, 263, 264, 265

deleting, 272

groups, 84

creating, command line and, 272, 273

deleting, 273, 274

managing, command line and, 272

primary group , 222

home directory, 250

listing, 224

login

name , viewing, 547, 548, 549, 550, 551, 552

modifying, 85

modifying own account, 268

description, 269, 270

password, 268, 269

shell, 269

pemissions, 84

removing, 85

Samba

adding, 383

usr subdirectory, 51

utilities

configuration

Samba, 378, 379

smbclient, 384, 385

smbmount , 385, 386