pid(3Tcl)

NAME
     pid - Retrieve process id(s)

SYNOPSIS
     pid ?fileId?


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 identifier of the
     current process.  All process identifiers are returned as decimal
     strings.


KEYWORDS
     file, pipeline, process identifier