The apropos command is used to search for strings in the whatis database. The whatis database is compiled by the makewhatis command, which searches for names and descriptions of all the man pages from a directory you specify as part of the command (optionally, or just defaults to /usr/share/man) and throws them into the database. Apropos then searches these strings and lists a short descriptor. If you’re thinking that I shouldn’t be lazy and I should remember every single command in Mac OS X, well, while I’d love to, but I have to point out that there are a lot of them… Also, I’ve learned that there are some very…