Write a shell script that allows users to choose and execute the respective Linux commands. The following are the command options that the users can select based on the respective alphabets: A: Display current user. B: Display current date. C: Display help page of a Linux command. D: Add new user to the system. E: Switch to another user. If the user selects any other choices from above, prompt the user to select again, only from A to E

This is regarding Linux System calls

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.

linux.txt is owned by a group that has full control over the file's access settings. Specify who has read/write access to linux.txt. Which of these commands will allow the user/owner to make whatever changes they want to the file?

C shell. A child process executes shell commands. Shell script. The user's executables may be in (/bin/). Shell doesn't take command line arguments or pipes.

In Linux  In a Linux system, it is recommended that you login and do all your workdirectly as the root user, this way you have full administrative power, and do nothave to worry about permissions. true or false

Write a shell script that reads a directory name and displays all the files in this directory if it is a valid directory; otherwise keeps displaying a message like "Enter a valid directory" until the user enters a valid directory. Hints: you can use a while loop.

In Command Prompt, we can run two commands on the same line independent of each other with the ampersand & (e.g. DIR & WHOAMI), and we can do the same in PowerShell with this character: Group of answer choices Comma , Semicolon ; Ampersand & Pipe |

A file called linux.txt has a group named "owner" that has full control over the file's access. Provide details on who has access to linux.txt and what privileges they have. Which of the following commands will provide the user/owner full access to the file?

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. The script should: ● ● ● Accept 1 argument from the command line (this is the User ID that you want to display info for) finger the User ID display any lines from the who command that match this User ID display any lines from the ps -ef command that match this User ID In addition, if the number of arguments is not exactly 1, display an appropriate error message and exit with an exit code of 1.