No Output When Running Program From Sub Directory

[Fabricio Guzman <guzman dot fabricio at gmail dot com>]

This problem seems simple yet I've spent the last two days researching
and have been unsuccessful.

I have a directory, "TopDir", with one subdirectory "SubDir".  The
"TopDir" has a program called "libtool."  If I'm in "TopDir" the
command "libtool --help" works as expected (I see the help text).
However, if I'm in "SubDir" and type the command "../libtool --help",
nothing shows up.  I don't see any text and the shell simply returns
to a prompt.  Am I not allowed to run programs residing in a different
directory?

Any help is greatly appreciated and I apologize for the noob question.

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