- in section 1 (User commands):
- in section 2 (System calls):
| ugetrlimit | umask | umount | umount2 |
| uname | unimplemented | unlink | unlinkat |
| unshare | uselib | userfaultfd | ustat |
| utime | utimensat | utimes |
- in section 3 (Library functions):
- in section 3curses (Ncurses - curses routines):
| update_panels |
- in section 3form (SVR4 compatible screen forms - ncurses):
| unfocus_current_field | unpost_form | userptr |
- in section 3menu (Ncurses - SVR4 compatible screen menus):
| unpost_menu | userptr |
- in section 3ncurses (Ncurses (terminal screen painting)):
- in section 3perl (Perl modules):
- in section 3pm (Perl modules):
| Unicode::GCString | Unicode::LineBreak | Unicode::UTF8 | Unix::Syslog |
| URI | URI::data | URI::Escape | URI::file |
| URI::Heuristic | URI::ldap | URI::QueryParam | URI::Split |
| URI::URL | URI::WithBase | URI::_punycode | UUID |
- in section 3ssl (SSL library):
- in section 3tcl (Tcl (Tool Command Language) library):
| unknown | unload | unset | update |
| uplevel | upvar |
- in section 4 (Device files):
| urandom |
- in section 5 (File formats):
- in section 6x (X Window System games):
| unicrud | unknownpleasures |
- in section 7 (Miscellaneous):
| udev | udp | udplite | unicode |
| units | unix | UNLISTEN | UPDATE |
| UPower | uri | url | urn |
| user-keyring | user-session-keyring | user_namespaces | utf-8 |
| utf8 | uts_namespaces |
- in section 8 (System administration commands):
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