pid(1T) 						       Tcl Built-In Commands							   pid(1T)

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NAME

       pid - Retrieve process identifiers

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.

EXAMPLE

       Print process information about the processes in a pipeline using the SysV ps program before reading the output of that pipeline:

	      set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
	      # Print process information
	      exec ps -fp [pid $pipeline] >@stdout
	      # Print a separator and then the output of the pipeline
	      puts [string repeat - 70]
	      puts [read $pipeline]
	      close $pipeline

SEE ALSO

       exec(1T), open(1T)

KEYWORDS

       file, pipeline, process identifier

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl									7.0								   pid(1T)