sisatty

Sisatty is a command-line utility in Unix-like operating systems that checks whether the standard input (stdin) is connected to a terminal. It is part of the GNU Core Utilities package and is commonly used in shell scripting to determine if the script is being run interactively or not. The name "sisatty" is derived from the function "isatty" in the C standard library, which performs a similar check.

The sisatty command takes no arguments and returns a status code of 0 if stdin is connected to a terminal, and 1 if it is not. This can be useful in scripts where different behavior is desired depending on whether the script is being run interactively or as part of a pipeline or redirection.

For example, a script might use sisatty to prompt the user for input only if it is being run interactively, and to skip the prompt if it is being run as part of a pipeline or redirection. This can help prevent unexpected behavior and improve the usability of the script.

Sisatty is a simple and useful tool for shell scripting, and is widely used in Unix-like operating systems. It is typically used in conjunction with other command-line utilities and shell scripting constructs to create robust and flexible scripts.