Tcl Built-In Commands                                     pid(1T)





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  ele-
     ments  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  iden-
     tifier  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

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:










Tcl                     Last change: 7.0                        1






Tcl Built-In Commands                                     pid(1T)



     
       ATRIBUTE TYPE     ATRIBUTE VALUE
    
     Availability         SUNWTcl        
    
     Interface Stability  Uncommitted    
    

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













































Tcl                     Last change: 7.0                        2