Figure 1: Simple directory structure

$ ls -l
drwxr-xr-x 2 01 Jan 1995 johnw users .
drwxr-xr-x 2 01 Jan 1995 johnw users ..
drwxr-xr-x 2 01 Jan 1995 johnw users sub_dir
rwxr-xr-x 1 01 Jan 1995 johnw users File1
rwxr-xr-x 2 01 Jan 1995 johnw users File2
rwxr-xr-x 2 01 Jan 1995 johnw users File3
rwxrwxrwx 2 01 Jan 1995 johnw users File4 ->/users/fred/file2
$