- in section 1 (User commands):
| objcopy | objdump | od | open |
| openvt |
- in section 1ssl (SSL programs):
| ocsp | openssl |
- in section 3 (Library functions):
| openproc |
| ordchr |
- in section 5 (File formats):
| oidentd.conf | oidentd_masq.conf | os-release |
- in section 7 (Miscellaneous):
| operator |
- in section 8 (System administration commands):
| oidentd | ownership |
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