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pipe -- Definition A pipe directs the output stream of one program into the input stream of another program, thus coupling the programs together. With pipes, two or more programs (or filters) can be coupled together to perform complex transforms on streams of data. For example, in the following command cat DATAFILE1 DATAFILE2 | sort | uniq -d the filter cat opens two files and prints their contents. Its output is piped to the filter sort, which sorts it. The output of sort is piped, in turn, to the filter uniq, which (with the -d option) prints a single copy of each line that is duplicated within the file. Thus, with this simple set of commands and pipes, a user can quickly print a list of all lines that appear in both files. See Also filter, mkfifo(), named pipe, pipe(), Using COHERENT