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Unix find is a pretty tricky but very useful utility that can often fool even experienced UNIX professionals with ten on more years of sysadmins work under the belt. It can enhance functionality of those Unix utilities that does not include tree traversal (BTW GNU grep has -r option for this purpose and can be used on its own to perform tree traversal task: grep -r "search string" /tmp.). There are several versions of find with the main two being POSIX find used in Solaris, AIX, etc and GNU find used in linux. GNU find can be installed on Solaris and AIX and it is actually a strong recommendation as there are some differences; moreover gnu find have additional capabilities that are often useful.
