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We use it as the default interactive shell for new accounts on all of our public systems.
Not many people write scripts in [t]csh. See Csh Programming Considered Harmful by Tom Christiansen for a discussion of problems with programming csh scripts.
It was slow to gain acceptance because earlier versions were encumbered by AT&T licensing. This shell is now freely available on all systems, but sometimes not installed by default on "free" Unix. There are two major versions. ksh88 was the version incorporated into AT&T SVR4 Unix, and may still be installed by some of the commercial Unix vendors. ksh93 added more features, primarily for programming, and better POSIX compliance.
On most systems, /bin/sh is now a POSIX compliant shell. Korn shell and Bash are POSIX compliant, but have many features which go beyond the standard. On Solaris, the POSIX/XPG4 commands which differ slightly in behaviour from traditional SunOS commands are located in /usr/xpg4/bin
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