LAB 51: SHELL METACHARACTERS

Make a directory called wildcards. Cd to that directory and type at the prompt:
```
touch ab abc a1 a2 a3 all a12 ba ba.1 ba.2 filex filey AbC ABC ABc2 abc
```
Write and test the command that will do the following:
1. List all files starting with a.
2. List all files ending in at least one digit.
3. List all files starting with a or A.
4. List all files ending in a period, followed by a digit.
5. List all files containing just two alphabetic characters.
6. List three character files where all letters are uppercase.
7. List files ending in 10, 11, or 12.
8. List files ending in x or y.
9. List all files ending in a digit, an uppercase letter, or a lowercase letter.
10. List all files not starting with a b or B.
11. Remove two character files starting with a or A.