8. You have a shell variable named LOGNAME that contains your login name. I want one command line that will set the shell variable GNUM to the group ID for you listed in the password file. Please do not directly use your login name in the command like "grep 'ruizhao' /etc/passwd", please use the LOGNAME. Hint: What is the format of /etc/passwd file? How to use a variable's value in command? How to use regular expression to find your login name in such a file? Or you may have a smarter way. 9. Write a complete command that will use "ps -ef and others to produce a list of your current processes but sorted by PPID. Pay attention to the output format from ps. You have a shell variable named LOGNAME that contains your login name