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Unix Shell Scripting was founded in 2004 and stepped foot in the ITSM. Shell Scripting is writing a series of commands for the shell to execute. It can combine lengthy and repetitive sequences of commands into a single and simple script, which can be stored and executed anytime. This reduces the effort required by the end user. In Unix, the Command Shell is the native command interpreter. It provides a command line interface for the users to interact with the operating system. Unix commands may also be executed non-interactively in the form of a Shell Script. The script is a series of commands that will be run together.
Shell scripts can be used for a variety of tasks from customizing your environments to automating your daily tasks.
The Bourne Shell (sh): This was one of the first shell programs that came with Unix and is also the most widely used one. It was developed by Stephen Bourne. The ~/.profile file is used as a configuration file for sh. This is also the standard shell used for scripting.
The C Shell (csh): The C-Shell was developed by Bill Joy, modeled on the C programming language. It was intended to improve interactivity with features such as listing the command history and editing commands. The ~/.cshrc and the ~/.login files are used as configuration files by csh.
The Bourne Again Shell (bash): The bash shell was developed for the GNU project as a replacement for sh. The basic features of bash are copied from sh, and also adds some of the interactivity features from csh. he ~/.bashrc and the ~/.profile files are used as configuration files by bash.