- update-xmlcatalog
- updatedb
- updatejail
- updateLysKOM
- update_indexes
- update_phishing_sites
- update_virus_scanners
- update_wdm_wmlist
- upgrade-system
- upgrade-windowmaker-defaults
- upgradedb
- upgradednformat
- upgrade_MailScanner_conf
- uphpmvault
- upnpd
- upowerd
- upsc
- upscmd
- upscode2
- upsd
- upsdrvctl
- upserver
- upsimage.cgi
- upslog
- upslug2
- upsmon
- upsrw
- upssched
- upsset.cgi
- upsstats.cgi
- upstart-dbus-bridge
- upstart-dconf-bridge
- upstart-event-bridge
- upstart-file-bridge
- upstart-local-bridge
- upstart-monitor
- upstart-socket-bridge
- upstart-udev-bridge
- uptimed
- urfkilld
- URONode
- usage
- usbhid-dump
- usbhid-ups
- usbip
- usbipd
- usbip_bind_driver
- usbview
- useradd
- userdel
- userhelper
- userlist
- usermod
- uservd
- usn-tombstone-cleanup.pl
- usplash
- util/sgeCA/sge_ca
- utmpset
- uucico
- uucpd
- uucpsend
- uuidd
- uusched
- uuxqt
- v4l-conf
- v86d
- validlocale
- vapt-get
- vattribute
- vbackup
MAN (8)
System administration commands and daemons