bash needs builtin 'which' command

[Dan Jacobson]

$ which true
/bin/true
but that's not what gets called by
$ true
etc. etc.  It seems that the only way to get 'which' to know about
bash builtins is to make it a builtin itself [in addition to, not
replacement for, /usr/bin/which, etc.]  That seems to be the right way
to get it to give the correct answer from within bash [where it will
know about builtins] or from outside of bash [where it will only know
about /bin, etc.].

Same goes for "whence" or whatever other similar to 'which' commands
like that are around these days.
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