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Some common shells are listed below, grouped by script syntax: Bourne-compatible shells Many of these shells have more than one variation.
Most of these variations are denoted by prefixing the name of an existing shell with additional letters that are short for whatever differentiates them from the original shell.
However, the C shell scripting language has its uses, particularly for writing scripts that set up environment variables for interactive shell environments, execute a handful of commands in order, or perform other relatively lightweight chores.
For example: The C shell is popular among some users as a shell for interacting with the computer because it allows simple scripts to be written more easily.
However, the C shell scripting language is limited in a number of ways, many of which are hard to work around.
However, the Bourne shell syntax is significantly more flexible and thus more widely used.
For this reason, this document only covers the Bourne shell syntax.