problem 1:

Illustrate out the substitution string function format with an illustration.

problem 2:

Illustrate the global substitution string function format with an illustration.

problem 3:

What is the employ of toupper & tolower functions, describe them with the appropriate illustration.

problem 4:

Illustrate out the decision- making statements with illustration programs.

problem 5:

Illustrate out the different string manipulators with an illustration awk shell script.