Find
From FreeBSDwiki
Used to find files or directories. A complicated beast that is worth it's time in finding out more about via the man pages. For bare-bones help in finding a particular file or directory, use in conjunction with grep:
samizdata# find / | grep "string"
will execute find on / and then only show you the results that match "string". Note that this is not optimal and can take a while on large systems.