./dstack.tests: line 9: pushd: no other directory
./dstack.tests: line 10: popd: directory stack empty
./dstack.tests: line 13: pushd: -m: invalid number
-pushd: usage: pushd [dir | +N | -N] [-n]
+pushd: usage: pushd [-n] [+N | -N | dir]
./dstack.tests: line 14: popd: -m: invalid number
-popd: usage: popd [+N | -N] [-n]
+popd: usage: popd [-n] [+N | -N]
./dstack.tests: line 15: dirs: -m: invalid number
dirs: usage: dirs [-clpv] [+N] [-N]
./dstack.tests: line 16: dirs: 7: invalid option