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This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
95 characters; the 52 alphabet characters belong to the Latin script. The remaining 43 belong to the common script. The 33 characters classified as ASCII Punctuation & Symbols are also sometimes referred to as ASCII special characters. Often only these characters (and not other Unicode punctuation) are what is meant when an organization says a ...
See the List of GNU Core Utilities commands for a brief description of included commands. Alternative implementation packages are available in the FOSS ecosystem, with a slightly different scope and focus (less functionality), or license. For example, BusyBox which is licensed under GPL-2.0-only, and Toybox which is licensed under 0BSD.
The system intercepts special characters in cooked mode and interprets special meaning from them. Backspace , delete , and Control-D are typically used to enable line-editing for the input to the running programs, and other control characters such as Control-C and Control-Z are used for job control or associated with other signals .
For example, in DOS 5, if the current directory is C:\TEMP, then TRUENAME command.com will display C:\TEMP\COMMAND.COM (which does not exist), not C:\DOS\COMMAND.COM (which does and is in the PATH). This command displays the UNC pathnames of mapped network or local CD drives. This command is an undocumented DOS command.
Some Unicode characters, such as Turkish letters, do not have HTML names, so a numerical reference is sometimes the only option using HTML. An HTML numeric character reference is of the form &#D; or &#xH;; D and H are the character’s Unicode code point in decimal and hexadecimal.
Man pages are often referred to as an online form of software documentation, [1] even though the man command does not require internet access. The environment variable MANPATH often specifies a list of directory paths to search for the various documentation pages. Manual pages date back to the times when printed documentation was the norm.