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Screenshot of a sample tcsh session
|Developer(s)||Ken Greer, Paul Placeway, Christos Zoulas, et al.|
|Stable release||6.17.00 / July 10, 2009|
tcsh (pronounced /tiːˈsiːʃɛl/, /ˈtiːʃɛl/, or as an acronym, /ˌtiː ˌsiː ˌɛs ˈeɪtʃ/) is a Unix shell based on and compatible with the C shell (csh). It is essentially the C shell with programmable command line completion, command-line editing, and a few other features.
The 't' in tcsh comes from the T in TENEX, an operating system which inspired Ken Greer, the author of tcsh, with its command-completion feature. Ken Greer worked on tcsh in the late 1970s at Carnegie Mellon University. Paul Placeway from The Ohio State University continued work on it in the 1980s, and since then it has been maintained by numerous people. Wilfredo Sanchez, the former lead engineer of Mac OS X, worked on tcsh in the early 1990s at MIT.
Early versions of Mac OS X shipped with tcsh as the default shell, but the default for new accounts is bash as of 10.3. (tcsh is still provided, and upgrading the OS does not change the shell of any existing accounts.) Iowa State's implementation of MIT's Project Athena (Project Vincent) by default uses tcsh as the default shell, although users can change this.