Tcl7.6 User Commands Man Page -- pid (n)
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pid - Retrieve process id(s)


pid ?fileId?


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.


file, pipeline, process identifier

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