Both [TclX] and [Expect] implement the Unix-familiar [fork]/exec/wait
interfaces, more-or-less.  How can core Tcl get along without them?
Its [exec] and [open] interfaces are slightly higher-level
abstractions that make more sense across platforms, and have proven
to be quite apt for development.  Note, in particular,
that [[... exec reaps from  ...]].




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[Category Command] from at least these two packages.