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Full Discussion: Difference in Shells
Top Forums Shell Programming and Scripting Difference in Shells Post 302338270 by cambridge on Monday 27th of July 2009 11:35:50 AM
Old 07-27-2009
Probably best to research this one yourself, because the answer is very long and involved. In short, ksh is sh with added features, csh syntax is more like C, tcsh is csh with added features, bash is highly compatible with ksh and takes some good features from tcsh. All shells are subtly different on different platforms and between versions, and may not be available on all platforms.

Try these resources:

Comparison of command shells - Wikipedia, the free encyclopedia
A's to Q's about BASH, the Bourne-Again SHell: Differences from other Unix shells
http://www.dartmouth.edu/~rc/classes/ksh/ksh-vs-sh.detail.html
http://www.in-ulm.de/~mascheck/various/shells/
 

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platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME
platform::shell - System identification support code and utilities SYNOPSIS
package require platform::shell ?1.1.4? platform::shell::generic shell platform::shell::identify shell platform::shell::platform shell _________________________________________________________________ DESCRIPTION
The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell. This package allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only requirement is that the other shell (identified by its path), is actually executable on the current machine. While for most platform this means that the architecture of the interrogated shell is identical to the architecture of the running shell this is not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run 32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers. For applications like a code repository it is important to identify the architecture of the shell which will actually run the installed packages, versus the architecture of the shell running the repository software. COMMANDS
platform::shell::identify shell This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell. platform::shell::generic shell This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell. platform::shell::platform shell This command returns the contents of tcl_platform(platform) for the specified Tcl shell. KEYWORDS
operating system, cpu architecture, platform, architecture platform::shell 1.1.4 platform::shell(n)

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