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bash-hackers-wiki/docs/dict/shell.md
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Shell

On UNIX(r), the shell is the main interaction tool between the user-level and the system. That doesn't necessarily mean the user always sits infront of a shell, but it's integral part of the system, not only an "optional commandline interpreter".

The main job of a shell is to execute commands as a user requests them. This behaviour alone doesn't help much. A shell knits some intelligence and flow control around the possibility to execute commands - it's a complete commandline-oriented user-interface (UI).

FIXME

See also

See also (external)