How can I hook into tcsh's TAB completion on Linux?

From the manpage: the complete builtin command can be used to tell the shell how to complete words other than filenames, commands and variables might get you started.

I do not know how to program in tcsh. But if you can, then you could look at the file named "bash_completion" from the archive (find the download link here. ) On line 1673 begins CVS completion code - and this might be portable to csh if you are familiar with the differences between bash/tcsh.

On my ubuntu machine, there is also a section for SVN completion (in /etc/bash_completion) that doesn't seem to be present in the maintainer's archive.

That's not Ubuntu-specific behavior, it's the bash-completion project. You could use that, if you can switch from tcsh to bash.

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