1tail (basename) of 'a/b/c' is 'c'
2tail (basename) of 'def' is 'def'
3tail (basename) of 'a.b.c' is 'a.b.c'
4tail (basename) of 'a.b/c' is 'c'
5tail (basename) of 'a' is 'a'
6tail (basename) of 'a.a' is 'a.a'
7tail (basename) of '.gitignore' is '.gitignore'
8tail (basename) of 'a' is 'a'
9tail (basename) of 'a.a' is 'a.a'
10tail (basename) of 'trailing/' is ''
11exit status 0
12