The Tenex C Shell
Tcsh is the Tenex Csh, and offers many improvements to the standard csh, while remaining totally compatible with csh. Its improvements over csh include better history control; pushd and popd for stacking directory positions; terminal locking; and which, where, and also read-only variables. It also provides spelling correction; an interactive tcsh will prompt the user with suggested options if it suspects that a typing error has been made.
In addition to automatic completion of commands and filenames, tcsh also adds automatic completion of variable names. It can be configured to do this in either case-sensitive or case-insensitive mode.
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