How to remove a symbolic link to a directory?

Remove the trailing slash:

With prompt:

$ rm test5

Without prompt:

$ rm -f test5

Try rm test5
(without the training slash).

The slash indicates that 'test5' is a direactory whereas it's actually a file linking to a directory.

You can run removing the trailing slash:

$ rm test5

This will remove the file (i.e. the symlink).

Alternatively you may use unlink:

$ unlink test5

Again you must omit the trailing slash since you are attempting to unlink the symlink not the directory.