1, first of all, to check whether AWK is already installed, in general this is the system built-in commands, direct a TAB key to see if you can fill in.

2, rpm query, through rpm -qa|grep awk check.

3. If awk is not installed, install it via yum or apt.

4. Check help via awk --help to see how to use awk.

5, awk get the last two lines of the file, awk '{print}' /etc/passwd |tail -n 2.

6, get the last line of the file? awk 'END{print}' /etc/passwd.

7. Actually, it's too much trouble to get it via awk, just use tail -n directly.