Using only the following UNIX commands: grep, ls, cat and wc, develop a single command line (regular expressions) to perform the task required. You dont need to use all commands

a) Print all the words in for example a dictionary file that start with un and end with ix. This includes the word unix itself.

(b) Find all the words in a dictionary file that contain all four lower-case characters that appear in the word unix (i.e. u, n, i, and x) in alphabetical order. For example, influx is such a word, but unfix is not.

(c) Print a single integer that is the number of 6-character words in for example a dictionary file that start with can and end with either a or c. For example, canada is such a word, but canzona, cancel and camera are not.