- 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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