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UNIX SHELL

C Shell; C shell (programming language); Berkeley shell

C shell

<operating system> (csh) The Unix command-line interpreter shell and script language by William Joy, originating from Berkeley Unix. Unix systems up to around Unix Version 7 only had one shell - the Bourne shell, sh. Csh had better interactive features, notably command input history, allowing earlier commands to be recalled and edited (though it was still not as good as the VMS equivalent of the time). Presumably, csh's C-like syntax was intended to endear it to programmers but sadly it lacks some sh features which are useful for writing shell scripts so you need to know two different syntaxes for every shell construct. A plethora of different shells followed csh, e.g. tcsh, ksh, bash, rc, but sh and csh are the only ones which are provided with most versions of Unix. (1998-04-04)

bandshell

THEATER

Bandshell; Band shell; Orchestra shell; Acoustical shell; Sound shell

¦ noun chiefly N. Amer. a bandstand in the form of a large concave shell with special acoustic properties.

shell company

COMPANY WITH FEW, IF ANY, ACTUAL ASSETS OR OPERATIONS

Shell company; Shell (company); Shell companies; Shell organization; Shell corporations; Artificial legal entity; Shell Company; Corporate shell; Shell (corporation); Empty shell (securities fraud); Empty shell (corporation); Corporate shells; Ghost company; Shell firm

A shell company is a company that another company takes over in order to use its name to gain an advantage. (BUSINESS)

N-COUNT

ويكيبيديا

C shell

The C shell (csh or the improved version, tcsh) is a Unix shell created by Bill Joy while he was a graduate student at University of California, Berkeley in the late 1970s. It has been widely distributed, beginning with the 2BSD release of the Berkeley Software Distribution (BSD) which Joy first distributed in 1978. Other early contributors to the ideas or the code were Michael Ubell, Eric Allman, Mike O'Brien and Jim Kulp.

The C shell is a command processor which is typically run in a text window, allowing the user to type and execute commands. The C shell can also read commands from a file, called a script. Like all Unix shells, it supports filename wildcarding, piping, here documents, command substitution, variables and control structures for condition-testing and iteration. What differentiated the C shell from others, especially in the 1980s, were its interactive features and overall style. Its new features made it easier and faster to use. The overall style of the language looked more like C and was seen as more readable.

On many systems, such as macOS and Red Hat Linux, csh is actually tcsh, an improved version of csh. Often one of the two files is either a hard link or a symbolic link to the other, so that either name refers to the same improved version of the C shell. The original csh source code and binary are part of NetBSD.

On Debian and some derivatives (including Ubuntu), there are two different packages: csh and tcsh. The former is based on the original BSD version of csh and the latter is the improved tcsh.

tcsh added filename and command completion and command line editing concepts borrowed from the Tenex system, which is the source of the "t". Because it only added functionality and did not change what already existed, tcsh remained backward compatible with the original C shell. Though it started as a side branch from the original source tree Joy had created, tcsh is now the main branch for ongoing development. tcsh is very stable but new releases continue to appear roughly once a year, consisting mostly of minor bug fixes.

https://en.wikipedia.org/wiki/C shell