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



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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 identi-fiers identifiers
       fiers  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)