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pipes

summary

    This subchapter looks at pipes.

    Pipes are most commonly used as a method to chain different utilities together, with the output of one piped to the input of the next.

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pipes

    This subchapter looks at pipes.

    Pipes are most commonly used as a method to chain different utilities together, with the output of one piped to the input of the next.

history

    Ken Thompson invented the pipe in 1972.

    The pipe is a standard mechanism for allowing the output of one program or process to be used as the input for another program or process.

    Pipes allow the UNIX philosophy of having many small programs that each do one function very well and then write scripts that combine these small utility programs to accomplish bigger tasks.

how to pipe

    To pipe the output of one UNIX command or utility to the next, simply place the | (vertical bar character) between the two processes:

    $ cat file01.txt | sort | lp

    The example obtains the contents of the designated file, sorts the contents, and then sends the result to the printer.

other

    In June 2009, Ken Milberg named this command as one of the Top 50 universal UNIX commands at this web page Top 50 Universal INIX commands. Note that this web page requires agreeing to be spammed before you can read it.

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