- in section 1 (User commands):
- in section 1ssl (SSL programs):
- in section 2 (System calls):
| oldfstat | oldlstat | oldolduname | oldstat |
| olduname | open | openat | openat2 |
| open_by_handle_at | outb | outb_p | outl |
| outl_p | outsb | outsl | outsw |
| outw | outw_p |
- in section 3 (Library functions):
| ordchr |
- in section 3form (SVR4 compatible screen forms - ncurses):
| opts |
- in section 3menu (Ncurses - SVR4 compatible screen menus):
| opts |
- in section 3ncurses (Ncurses (terminal screen painting)):
| opaque | ospeed | outopts | overlay |
| overwrite |
- in section 3perl (Perl modules):
| O | ODBM_File | ok | Opcode |
| open | ops | overload | overloading |
- in section 3pm (Perl modules):
| oo | oose | ouse |
- in section 3ssl (SSL library):
- in section 3tcl (Tcl (Tool Command Language) library):
| oo_class | oo_copy | oo_define | oo_objdefine |
| oo_object | open |
- in section 3tk (Tk widget library):
| option | options |
- in section 5 (File formats):
- in section 7 (Miscellaneous):
| ompi_crcp | opal_crs | operator | org.debian.apt |
| org.debian.apt.transaction | orte_filem | orte_hosts | orte_snapc |
| orte_sstore |
- in section 7ssl (SSL library):
- in section 8 (System administration commands):
- in section 8postfix (Postfix mail transport agent):
| oqmgr |
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