Ausam/doc/man/man1/tap.1

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including files from this version of Unix. 
.th TAP I 15/May/79
.sh NAME
tap \*- look into running pipes
.sh SYNOPSIS
.bd tap
[-\c
.bd fildes\c
]
.bd pid\c
s
.sh DESCRIPTION
.it Tap
is a plumbing service allowing users to inspect the contents
of an active pipe.
This is mostly useful for determining whether the pipeline has
become blocked (due to program errors).
.s3
Normally tap is conected to a process driving a standard output
pipe (i.e.
.it fildes
= 1).  This however can be changed by specifing 
.it fildes
for the given set of processes.
.sh FILES
/, /unix, /dev/mem, /dev/swap
.sh "SEE ALSO"
pipe(2)
.sh AUTHOR
Bryan Palmer
.sh BUGS
Due to how UNIX manipulates pipes the pipe contents may 
appear mangled.