1Execute a directory
2Execute a non-executable file
3Execute a script with a bad interpreter name
4Execute a binary file
5Execute a non-existent file
6Execute a non-existent file (2)
7Execute a valid script with a #! line
8Execute a valid script without a #! line
9tata
10Execute a valid script with #! but no interpname
11no space after #!
12Execute a zero-length file
13