tcsh

tcsh is a command line shell or command interpreter for Unix-like operating systems. It stands for "TENEX C Shell" and is an enhanced version of the original C shell. tcsh provides improved interactive features and more powerful scripting capabilities compared to the original shell. One of its key features is the command line editing mode, which allows users to easily edit and modify their commands before execution. It supports various advanced features like command and filename completion, which can save time and reduce typing. tcsh also supports history substitution, allowing users to recall and reuse previously executed commands by using shorthand notations. In addition, it provides built-in support for arithmetic operations and aliasing, making it easier to create custom commands and shortcuts. tcsh allows users to customize their shell environment through the use of configuration files and shell variables. It has a rich set of built-in commands and utilities, and it can execute shell scripts written in tcsh or other compatible shells. tcsh is widely used in Unix-based systems and is popular among Unix power users and developers due to its feature-rich nature and ease of use.