1 tail (basename) of 'a/b/c' is 'c'
2 tail (basename) of 'def' is 'def'
3 tail (basename) of 'a.b.c' is 'a.b.c'
4 tail (basename) of 'a.b/c' is 'c'
5 tail (basename) of 'a' is 'a'
6 tail (basename) of 'a.a' is 'a.a'
7 tail (basename) of '.gitignore' is '.gitignore'
8 tail (basename) of 'a' is 'a'
9 tail (basename) of 'a.a' is 'a.a'