I'm still in the process of tagging pages that were migrated from the old site, so for now you're best off using the search engine rather than relying on the tags.
- Find filenames of a certain length - To find files whos filenames have a certain length, you can use various combinations of the ls, egrep and find commands. E.g. find files that have 9 characters followed by .txt: me@pc ~/tmp $ ls ?????????.txt analytics.txt capilinks.txt particles.t...