This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
This is an ancient post with no relevance to modern systems.
Yes. SCO's csh is both ancient and broken, so many people don't use it. Note that for many systems there's a specific warning in your manual that you should not use csh as root's shell.
Consider replacing it with tcsh, available from a number of places including Skunkware (ftp://stage.sco.com/skunkware/). There are no known problems in simply replacing /bin/csh with tcsh, with the possible exception SCOAdmin Software complaining about an incorrect checksum when verifying your software.
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