C shell could have been the de facto standard had the parser not been buggy as hell and had there been proper facilities for stdin and stdout like in Bourne shells.

tcsh is my default shell, but I never program in it because of “C shell considered harmful”[1]. I write my programs in original Bourne shell instead for maximum portability.

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[1] http://www.faqs.org/faqs/unix-faq/shell/csh-whynot/