GNU Coreutils documentation as a whole is very useful. http://www.gnu.org/software/coreutils/manual/ http://www.gnu.org/software/coreutils/manual/ To read on t

GNU Coreutils documentation as a whole is very useful. http://www.gnu.org/software/coreutils/manual/ http://www.gnu.org/software/coreutils/manual/ To read on the command line, try: info coreutils Also see, http://en.wikipedia.org/wiki/GNU_Core_Utilities http://en.wikipedia.org/wiki/GNU_Core_Utilities