Showing content from http://www.tcl.tk/man/tcl8.1/TclCmd/../TclCmd/../Keywords/../TclCmd/pid.htm below:
Tcl Built-In Commands - pid manual page
NAME pid - Retrieve process id(s) SYNOPSISpid ?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 isn't 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. KEYWORDSfile, pipeline, process identifier
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