Create two versions of a command to display the access times of all the fi les in your working directory with a name that consists of the characters “backup”, followed by a single character, followed...

Create two versions of a command to display the access times of all the fi les in your working directory with a name that consists of the characters “backup”, followed by a single character, followed by 2 digits. The fi rst command should use predefi ned character classes. The second command should use ranges.