49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
|
'\"
|
||
|
|
'\" Copyright (c) 1993 The Regents of the University of California.
|
||
|
|
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
|
||
|
|
'\"
|
||
|
|
'\" See the file "license.terms" for information on usage and redistribution
|
||
|
|
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
|
|
'\"
|
||
|
|
.TH pid n 7.0 Tcl "Tcl Built-In Commands"
|
||
|
|
.so man.macros
|
||
|
|
.BS
|
||
|
|
'\" Note: do not modify the .SH NAME line immediately below!
|
||
|
|
.SH NAME
|
||
|
|
pid \- Retrieve process identifiers
|
||
|
|
.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 is not 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)
|
||
|
|
|
||
|
|
.SH KEYWORDS
|
||
|
|
file, pipeline, process identifier
|