This is a list of the shell commandss of the most recent version of the Portable Operating System Interface (POSIX) IEEE Std 1003.1-2024 which is part of the Single UNIX Specification (SUS). These commands are implemented in many shells on modern Unix, Unix-like and other operating systems. This list does not cover commands for all versions of Unix and Unix-like shells nor other versions of POSIX.

As is typical in the context of a POSIX system, the term file refers to an item of a file system which can be a regular file, a directory or several other more specialized types.

Columns:

1. Command: The text one enters to launch the command.

2. Category: Functional categorization.

3. Optionality: Indicates whether the command is mandatory or optional in order to achieve conformance. If the latter, then a code indicates the optional functionality group to which the command belongs.

   1. Batch environment (BE): Batch job control.

   2. C‑language development (CD): For developing software in C.

   3. FORTRAN development (FD): For developing software in FORTRAN.

   4. FORTRAN runtime (FR): Runtime‑support for FORTRAN.

   5. Software development (SD): For developing software; not language specific.

   6. User portability (UP): Addresses consistency at the user interface level.

   7. X/Open System Interfaces (XSI): Historically UNIX-like features that were common on System V–style systems.

   Description: Describes what the command does.

4. First appeared: Identifies an operating system version in which the command was first provided.

See also

• GNOME Core Applications

• GNU Core Utilities

• List of GNU packages

• List of KDE applications

• List of Unix daemons

• Unix philosophy

• util-linux

References

External links

• IEEE Std 1003.1,2004 specifications

• IEEE Std 1003.1,2008 specifications

• IEEE Std 1003.1,2024 specifications

• Rosetta Stone For *Nix configurable list of equivalent programs for *nix systems.

• The Unix Acronym List: Unix Commands explains the names of many Unix commands.