pipe commands questions in Linux:

1. Write a piped set of commands using only ls -l and egrep to find the number of files in /dev that are character-type (character-type files have use the letter c for type instead of for regular files or d for directories).

2. Write a piped set of commands to find all devices in /dev that are group writable but not group readable.

3. Write a piped set of commands to find all running processes whose owner is neither root nor Student.

4. Write a piped set of commands to find all files in /proc whose names are exactly 4-digit numbers (no 5-digit numbers).