UIDs (user IDs)
about, 32, 816
NFS and, 281s
SUID permissions, 32–33
umask command, 32, 816
umask file, 287
umask group settings, 302, 303
umount.cifs command, 522, 809
Unix-type operating systems
development of Linux from, 444
Red Hat differences from, 3
Samba's interoperability between
Windows and, 519
tips for administrators of, 255
unmounting and remounting filesystems, 17
up2date
automatic dependency resolution with, 237
yum command replacing, 693
updatedb command, 21, 23
updating
dependency resolution and RPM, 237
GRUB, 150–152
grub.conf file, 391–392
kernels, 226–227, 379
packages with yum command, 242
with Pup, 236
software in first boot, 124
upgrading
kernels, 389–390
RPMs, 224
URLs
access via lftp command, 51–53
accessing with text or graphical browser, 50–51
USB devices
Linux support for, 78
sharing IRQs, 5
USB key
booting from installation, 91–92
creating installation, 89–90
mounting, 201–203
using automounter with, 207
USB ports, 5
used-based security for Apache, 460–461
User Access tab (Add NFS Share dialog), 500–501
user administration. See also users
command line tools for, 274–277, 283–284
managing user environment, 285–287
overview of, 272
Red Hat User Manager, 277–280
self test and answers, 321–322, 324–325
shell configuration files, 287–290
summarized, 317–318
tips for managing user accounts, 280–281
two-minute drill, 319–320
working with special groups, 301–305
user IDs, 275
user interface. See also command line; GUI; X Window System
CUPS Web-based, 349–351
display managers, 663
User Mapping options (SELinux Management Tool), 715
user private groups
configuring ownership and permissions for Samba home directory, 531
creating group Samba directory, 532–533
Red Hat scheme for, 280–281, 301
User Properties dialog (Red Hat User Manager), 282, 283
useradd command, 276, 277
usermod command, 283, 816
users. See also root user account; UIDs
about, 31–32
adding, 273, 274–275, 276, 277, 279–280
Apache user-based security, 460–461
assigning password for, 276–277
authenticating network, 313–317
categories of, 273–274
checking for authorized, 305–313
configuring in first boot process, 124
configuring Samba, 539–540
creating in vi, 10–11
deleting, 281
disk quotas for, 290–301
errors running yum command from local system, 239
including in groups, 275–276
limiting access to su and sudo commands, 284–285
logging in for exam as root, 273
managing, 280–281, 283–284, 534–535
modifying, 281–283
POP, 589
securing with tcp_wrappers, 694–696
security levels for, 693
superusers, 34, 815
using corresponding Samba and Windows, 529, 533
/usr/src/linux directory, 393–394
/usr/src/redhat directory, 231
uucp, 586