U

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u command in sysrq
-u switch for tunctl 2nd
ubd devices
     advantages of
     for filesystem access
     image backup for
     partitioning
ubd option
ubd0 file
ubda switch for COW files
ubdb file
     for copying data into instances
     for swap space
udb option
UID root
UIDs (user IDs)
     in filesystem extensions
     in ownership
umid (unique machine ID)
umid directory
     in small server setup
     process IDs in
     with jails
umid option
uml.ctl socket
uml_dir option
uml_mconsole
uml_mconsole command 2nd [See also Management Console (MConsole).]
     for bridging
     for copying data into instances
     for devices
     for host ports
     for hosts 2nd
     for network devices
     for TUN/TAP device connectivity
     for virtual serial lines
     reference
uml_moo
uml_moo tool
     for merging COW files
     reference
UML_NET options
uml_net utility 2nd 3rd
UML_RANDOM option
UML_REAL_TIME_CLOCK option
uml_switch
uml_switch process
     configuring
     example
     for isolated networks
     reference
UML_WATCHDOG option 2nd
uname command
Unique machine ID (umid)
Unique machine id (umid) directory
     in small server setup
     process IDs in
     with jails
UNIX sockets
     in MConsole
     with hostfs
     with humfs
     with uml_switch
-unix switch for uml_switch
Unplugging devices
Unprivileged contexts
untar command 2nd
User IDs (UIDs)
     in filesystem extensions
     in ownership
User mode vs. kernel mode
User notifications
Utilities reference
     humfsify