O

objcopy:- copy and translate object files

objdump:- display information from object files.

od:- dump files in octal and other formats

oldfind:- search for files in a directory hierarchy (Ex:- oldfind /etc/)

on_ac_power:- test whether the computer is running on line power (Ex:- on_ac_power)

open:- open, creat - open and possibly create a file or device

openssl:- OpenSSL is a cryptography toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) network protocols and related cryptography standards required by them.

openvt:- start a program on a new virtual terminal (VT).

osd_login:-

os-prober:- Discover bootable partitions on the local system.

ownership:- Compaq ownership tag retriever