Which of the following commands changes all occurrences of the word "bob" in file data to "Bob" and prints the result to standard output?

Which of the following commands will change all CR-LF pairs in an imported text file, userlist.txt, to Linux standard LF characters and store it as newlist.txt?

Which of the following signals is sent to a process when the key combination Ctrl+Z is pressed on the keyboard?

Which Debian package management tool asks the configuration questions for a specific already installed package just as if the package were being installed for the first time?
(Specify ONLY the command without any path or parameters.)

Which of the following commands is used to change options and positional parameters within a running Bash shell?