gash/tests/data/basename.sed

/^.*\/\([^/][^/]*\)\/*$/{
	    s//\1/
	    q
	  }
  /^X\/\(\/\/\)$/{
	    s//\1/
	    q
  }
  /^X\/\(\/\).*/{
	    s//\1/
	    q
  }
  s/.*/./; q