4) To inhibit command substitution when echoing a string, we can use a) Double quotes (b) Grave accent (c) Single quote (d) Curly brace 5) How to obtain the value of command line arguments in a shell program? a) S0 would be the first line argument, S1 would be the Second command line argument, S2 the Third, and so on (b) $1 would be the first command line argument, $2 the second, and so on $O is the name of the script or function (c) Both a and b are correct (d) Both a and b are incorrect Which statement below is incorrect for shell? (a) Shell is a command interpreter. (b) When a shell is started, it reads and executes a special start up file. (c) When a shell is started, it removes all the files in user's home directory (d) The prompt in terminal is displayed by shell. 6)