- twintro
- twprint
- typename_macro
- typetest
- tzselect
- u2boat
- u2spewfoo
- u32
- uanytun
- ucarp
- udevadm
- udevd
- udiskie
- udisks
- udisks-daemon
- udisksd
- udpsvd
- ufiformat
- ufw
- ufw-framework
- uif
- ulatencyd
- ulistd
- ulog-acctd
- ulogd
- umount
- umount.crypt
- umount.davfs
- umount.ecryptfs
- umount.nfs
- umount.nfs4
- umount.nilfs2
- umount.storaged
- umount.udisks2
- unafs
- unattended-upgrade
- unbound
- unbound-anchor
- unbound-checkconf
- unbound-control
- unbound-control-setup
- unexpunge
- unhide
- unhide-tcp
- unhide.rb
- uni
- uniconfd
- uniconv
- unionfs-fuse
- unique
- unix2_chkpwd
- unix_chkpwd
- unix_update
- unregister-common-lisp-{implementation|source
- unshadow
- upclient
- update-aide.conf
- update-alternatives
- update-apt-xapian-index
- update-auctex-elisp
- update-binfmts
- update-ca-certificates
- update-canna-dics_dir
- update-catalog
- update-ccache-symlinks
- update-command-not-found
- update-cracklib
- update-cudf-solvers
- update-debian-edu-artwork-joy
- update-debian-edu-artwork-lines
MAN (8)
System administration commands and daemons