pid man page on Archlinux

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pid(n)			     Tcl Built-In Commands			pid(n)

______________________________________________________________________________

NAME
       pid - Retrieve process identifiers

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 is not 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.

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(n), open(n)

KEYWORDS
       file, pipeline, process identifier

Tcl				      7.0				pid(n)
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