-x::
Turn on shell tracing (i.e., `set -x`) during the tests
- themselves. Implies `--verbose`. Note that this can cause
- failures in some tests which redirect and test the
- output of shell functions. Use with caution.
+ themselves. Implies `--verbose`. Note that in non-bash shells,
+ this can cause failures in some tests which redirect and test
+ the output of shell functions. Use with caution.
-d::
--debug::