Create a hierarchy of three new directories at the same time with the names of: top, medium and low. Medium should be a subdirectory of top and low should be a subdirectory of medium. (using one command line) QUESTION 14 You have many files that begin with the word "account" and that end with digits to designate a year and a month, such as account1215, account 0114, and so on. What is the command that enables you view a long list for all of these files that start with account and end with four digits? QUESTION 15 What series of commands did you enter to clear the screen display the current date and time with the format as "Today is Monday, August 27, 2018", and then display a message "My shell is /bin/bash" with a SHELL variable. (Hint: use $SHELL value) Create a hierarchy of three new directories at the same time with the names of: top, medium and low. Medium should be a subdirectory of top and low should be a subdirectory of medium. (using one command line) QUESTION 14 You have many files that begin with the word "account" and that end with digits to designate a year and a month, such as account1215, account 0114, and so on. What is the command that enables you view a long list for all of these files that start with account and end with four digits? QUESTION 15 What series of commands did you enter to clear the screen display the current date and time with the format as "Today is Monday, August 27, 2018", and then display a message "My shell is /bin/bash" with a SHELL variable. (Hint: use $SHELL value)