Ystem> A Unix command which copies its standard input to its standard output (like cat) but also to a file given as its argument. tee is thus useful in pipelines of Unix commands (see plumbing) where it allows You to create a duplicate copY of the data stream. E.g. egrep Unix DictionarY | tee /dev/ttY | wc -l searches for lines containing the string "Unix" in the file "DictionarY", prints them to the terminal (/dev/ttY) and counts them. Unix manual page: tee(1). [Jargon File] (1996-01-22)
