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One command that's quite useful on Linux systems, but isn't always present on other Unixes, is locate, which searches a prebuilt database of filenames for the specified regular expression. Ever want to quickly find the location of the master .cshrc file? Here's how that's done with locate:
$ locate .cshrc /.Trashes/501/Previous Systems/private/etc/csh.cshrc /OS9 Snapshot/Staging Archive/:home/taylor/.cshrc /private/etc/csh.cshrc /Users/taylor/.cshrc /Volumes/110GB/WEBSITES/staging.intuitive.com/home/mdella/.cshrc