Tom Christiansen's Csh Programming Considered Harmful used to be posted to various Usenet comp.unix groups, nigh on ten years ago or so. I consider it sort of a pity that it isn't still being posted, because every so often someone still decides that writing shell scripts in csh would be a good idea.

Some of the problems Christiansen identified have since been fixed by modern versions of tcsh , but not all of them.

(The article can also serve as an interesting catalog of sh programming tricks.)