Problem
1. Is an option also an argument? How many arguments are there in this command? cat < foo=""> bar
2. Why shouldn't you have a filename beginning with a -?
3. Reduce the number of keystrokes to execute this command: tar -t -v -f /dev/fd0.
4. Look up the tar man page to find out whether the command tar -cvfb 20 foo.tar *.c is legitimate or not. Will the command work without the - symbol?