Before I added the else if/else, when i only just had the:
if (/Easy: /) .. part

The program would launch when I put awk -f oscp-notes.awk and then put input, &c.
It would then print out appropriate Easy machines; however, after I added the else if section.
It will not print either easy or medium machines now. I do not have any errors. I figured that I needed to close(file) so I could re-read. I am stuck. I would like to be able to read/close and make rest of conditional statements to include user input whether it is easy/medium/hard/insane. Is this possible?

BEGIN { <br/>
    printf "Please select a chapter by entering chapter number: "
    getline entry < "-"
    $2 == entry
    file = "TJnulls.txt"

Test if statement

    if (entry == 2) {
        printf "Please select difficulty (easy, medium, hard, insane): "
        getline difficulty < "-"
        $3 == difficulty
        if (difficulty == easy) {
            {print "\n"}
            {print "Obtaining the list of easy machines:\n"}
            while (( getline<file) > 0) {
            if (/Easy: /) {
                {print $2};
            } else {
                close("TJnulls.txt");
                break;
            }
            }
        } else if (difficulty == medium) {
            {print "\n"}
            {print "Obtaining the list of medium machines:\n"}
            while ( ( getline<file) > 0) {
            if (/Medium: /)
                {print $2}
            }
        }
     }
}