> Log Message:
> Provided a link to the Open Group's utilities web page.
> 
> Tested "test foo == bar" with test(1) from the GNU coreutils. It does
> _not_ know the "==" operator.

Thanks for telling us. Now when I report problems to "Linux" developers I 
can mention that also!

# /usr/bin/test foo == foo && echo yes
/usr/bin/test: ==: binary operator expected
# /usr/bin/[ foo == foo && echo yes
/usr/bin/[: ==: binary operator expected
# /usr/bin/test foo = foo && echo yes
yes
# /usr/bin/test --version | head -1
test (GNU coreutils) 4.5.3