Don't know if if it'll work with plan 9 perl but atchange may be an option?
http://www-lmmb.ncifcrf.gov/~toms/atchange.html


Abhey

On 19 Apr 2005, at 07:57, YAMANASHI Takeshi wrote:

Then, what is the purpose for?

Just as same as the original watch (troff type setting). Actually, I'm doing a LaTeX work now, and thought it would be handy if the "platex; xdvi" command chain is run automatically.

I thought you are going to watch, say, kernel sources changed by
someone else...

oh, it would be fun to see diff whenever some changed some file, too. --






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