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RedHat 9 (Linux i386) - man page for unbuffer (redhat section 1)

UNBUFFER(1)						      General Commands Manual						       UNBUFFER(1)

unbuffer - unbuffer output
unbuffer program [ args ]
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). Exam- ple: unbuffer p1 | unbuffer p2 | unbuffer p3 | p4
The man page is longer than the program.
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
Don Libes, National Institute of Standards and Technology 1 June 1994 UNBUFFER(1)