Shell programming in Linux and Unix: Experiment with changing your PS1 and PS2 prompt so it is set to what you want once you log in. You can also add to your PATH variable and set a CDPATH. A. What file should you modify in your home directory to do this task? B. What command(s) will change the prompts and what command(s) will have that change take effect once you log in?

Which of the following statements is true?a. The GRUB boot loader is stored in the /usr/grub directory.b. LILO needs to be reinstalled after it has been modified.c. The GRUB2 boot loader is often used on legacy Linux systems.d. GRUB needs to be reinstalled after it has been modified.

do the following in the codeThe shell environment should contain shell=<pathname>/myshell where <pathname>/myshell is the full path for the shell executable (not a hardwired path back to your directory, but the one from which it was executed). #!/bin/bashflag=0echo "Welcome to myshell"while [[ $flag == 0 ]]doread -p "myshell > " str#spilliting the textIFS=' ' #setting space as delimiterread -ra ARR <<<"$str" #reading str as an array as tokens separated by IFScommand=0 # >>>>>>>>>>>>>>>>>>>>>>>>>> 1. cd <<<<<<<<<<<<<<<<<<<<<<<<<if [[ ${ARR[0]} == "cd" ]]thencommand=1word=$(echo ${ARR[@]} | wc -w) # after cd hav no argument then report to current directoryif [[ $word == 1 ]]thencd $PWDelseif [[ -d ${ARR[1]} ]]thencd ${ARR[1]}elseecho "[${ARR[1]}] path is not correct"fififi…

On the cmsy255 server, write a bash shell script called usrinfo that displays information about a specified user.  Make sure the script file is executable.  Also make sure that you can run the script without having to specify the directory.  For example, you should NOT have to enter ./usrinfo in order for it to run.