At /contrib/nemo/tags in sources you can find a tool to index and search files by content.
http://plan9.lsub.org/magic/man2html/1/mktags has the man page. Experimental, as usually. Bugs to me. thanks. BTW, at /contrib/nemo/mail2fs you have a (also experimental) mail utility. http://plan9.lsub.org/magic/man2html/1/mails has the man page.
