'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" All rights reserved.
'\"
'\" Permission is hereby granted, without written agreement and without
'\" license or royalty fees, to use, copy, modify, and distribute this
'\" documentation for any purpose, provided that the above copyright
'\" notice and the following two paragraphs appear in all copies.
'\"
'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
'\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'\"
'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
'\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
'\" AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
'\" ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
'\" PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
'\" 
'\" 
.so man.macros
.HS pid tcl 7.0
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
pid \- Retrieve process id(s)
.SH SYNOPSIS
\fBpid \fR?\fIfileId\fR?
.BE

.SH DESCRIPTION
.PP
If the \fIfileId\fR argument is given then it should normally
refer to a process pipeline created with the \fBopen\fR command.
In this case the \fBpid\fR 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 \fIfileId\fR refers to an open file
that isn't a process pipeline.
If no \fIfileId\fR argument is given then \fBpid\fR returns the process
identifier of the current process.
All process identifiers are returned as decimal strings.

.SH KEYWORDS
file, pipeline, process identifier
