Stream Buffer


Stream Buffer#



unbuffer disables the output buffering that occurs when program output is redirected. For example, suppose you are watching the output from a fifo by running it through od and then more.

    od -c /tmp/fifo | more

You will not see anything until a full page of output has been produced.

You can disable this automatic buffering as follows:

    unbuffer od -c /tmp/fifo | more

When you have a pipeline, unbuffer must be applied to each element except the last (since that doesn’t have its output redirected). Example:

        unbuffer p1 | unbuffer p2 | unbuffer p3 | p4