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Problem referencing libraries in tcl 8.6, e.g. fileutil

I have added the tcl intepreter into my Cygwin (64-bit) installation, but
when trying to run some code samples using the fileutil library, e.g. the
foreachLine command, I'm getting 'invalid command name
"fileutil::foreachLine"'. I've even tried prefixing the command with "tcl::"
as I had to do for the mathfunc:: library functions, but still get the error
message. Is there an additional tcl package I need to install, or what?

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