In tclsh, An executable command can come from the tcl itself(puts set), from c-code(MyProcA MyProcB), or from the linux environment(echo vim). Assuming that I've got commands that have already been executed via history, how should I distinguish between the sources of these commands?
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Direct running of
echois a feature of the commandunknown. Normally, you'd need to doexec echo...Apart from that, there isn't really much of a distinction between commands supplied by the Tcl implementation, commands defined by third-party extensions, and (to a lesser extent) commands defined by calling something like
proc. They're all just commands. Some of those commands support additional introspection, e.g., viainfo bodyorinfo object, but that doesn't make them any less a command than something that's handled by compilation to Tcl's bytecode or as a piece of C code.