- in section 1 (User commands):
- in section 1ssl (SSL programs):
| ocsp | openssl |
- in section 2 (System calls):
| oldfstat | oldlstat | oldolduname | oldstat |
| olduname | open | openat | outb |
| outb_p | outl | outl_p | outsb |
| outsl | outsw | outw | outw_p |
- in section 3 (Library functions):
| offsetof | on_exit | opendir | openlog |
| openpty | open_memstream | open_wmemstream | optarg |
| opterr | optind | optopt |
- in section 3perl (Perl modules):
| O | Object::Accessor | ODBM_File | Opcode |
| open | ops | overload | overloading |
- in section 4 (Device files):
| openchrome |
- in section 7 (Miscellaneous):
| operator |
- in section 8 (System administration commands):
| ownership |
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