At the command prompt, type ls $-$l and press Enter. Do you have permission to execute the hosts file? Should you make this file executable? Why? Next, type ls $$l $/$usr$/$bin at the command prompt and press Enter. Note how many of these files to which you have execute permission. Type file $/$usr$/$bin$/*|$ more at the command prompt and press Enter to view the file types of the files in the $/$bin directory. Should these files have the execute permission?