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-rw-r--r--doc/pid.n17
1 files changed, 15 insertions, 2 deletions
diff --git a/doc/pid.n b/doc/pid.n
index f835b5e..9811cb7 100644
--- a/doc/pid.n
+++ b/doc/pid.n
@@ -5,14 +5,14 @@
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: pid.n,v 1.3 2000/09/07 14:27:50 poenitz Exp $
+'\" RCS: @(#) $Id: pid.n,v 1.3.18.1 2004/10/27 14:23:57 dkf Exp $
'\"
.so man.macros
.TH pid n 7.0 Tcl "Tcl Built-In Commands"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
-pid \- Retrieve process id(s)
+pid \- Retrieve process identifiers
.SH SYNOPSIS
\fBpid \fR?\fIfileId\fR?
.BE
@@ -29,6 +29,19 @@ 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 EXAMPLE
+Print process information about the processes in a pipeline using the
+SysV \fBps\fR program before reading the output of that pipeline:
+.PP
+.CS
+set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
+# Print process information
+exec ps -fp [\fBpid\fR $pipeline] >@stdout
+# Print a separator and then the output of the pipeline
+puts [string repeat - 70]
+puts [read $pipeline]
+close $pipeline
+.CE
.SH "SEE ALSO"
exec(n), open(n)