redhat man page for pid

pid(n)							       Tcl Built-In Commands							    pid(n)

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NAME
       pid - Retrieve process id(s)

SYNOPSIS
       pid ?fileId?
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DESCRIPTION
       If  the	fileId	argument is given then it should normally refer to a process pipeline created with the open command.  In this case the pid
       command will return a list whose elements are the process identifiers of all the processes in the pipeline, in order.   The  list  will	be
       empty  if fileId refers to an open file that isn't a process pipeline.  If no fileId argument is given then pid returns the process identi-
       fier of the current process.  All process identifiers are returned as decimal strings.

SEE ALSO
       exec(n), open(n)

KEYWORDS
       file, pipeline, process identifier

Tcl									7.0								    pid(n)