http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/pid.htm 

This command can be very useful when you have used [open] to open
a pipeline command - you can then get the process id to do a kill, etc.


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- [Arts and crafts of Tcl-Tk programming]

[[
[Category Command] |
[Category Channel] |
[Category Interprocess Communication]
]]