What are the UNIX commands for the questions below?

Couse name : Unix

 

3 Q1. 3 Q2. 4 Q3. 4 Q4. 4 Q5. 4 Q6. 6 Q7. 6 Q8. 6 Q9. 40 Change every newline character in a file named filel to a space and save the output to another file named file2. List all users on our mars system who use bash as the login shell. Find how many different userids who are currently logged on to our mars system. Find all English words whose first letter is b and the last letter is c. Find how many times you have logged on to our mars system on Fridays in October. Please use one grep command to list all lines that contain a character hat (^) as the first character, a digit (0, 1, ..., or 9) as the third character, a dollar sign ($) as the third last character, and a star ( info. as the last character in a file named Read the online manual of the be command. be is an arbitrary precision calculator that can perform arithmetic operations. Use be in a pipeline to find the average of three numbers, 11.1, 12.2, and 13.3. Please note that redirecting is not allowed in your answer. List all userids, which are currently logged on to our mars system, a) with at least five characters b) with at most five characters c) with exactly five characters Create an alias named listdotfile to list all hidden files in long format from the working directory. All hidden directories should not be part of the output.