This is a list of Unix commands as specified by IEEE Std 1003.1-2008, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.

See also. List of FTP server return codes - in response to commands from a client, the FTP server returns reply codes; External links. RFC 697 - CWD Command of FTP RFC 959 - File Transfer Protocol (FTP) RFC 1639 - FTP Operation Over Big Address Records (FOOBAR) RFC 2228 - FTP Security Extensions RFC 2389 - Feature negotiation mechanism for the File Transfer Protocol