Find and kill zombie process

 ## In linux, 

## find zombie process , grep Z or 'defunc'

host:~$ ps   aux  | grep Z

host:~$ ps aux  | grep defunc

   option:  a  : all with tty, include other users

                 u : display user-oriented format

                  x : processes without controlling ttys

## parent process must be killed  to kill  zombie prcess, find parent , using 'pstree'

host:~$ pstree -paul    
   options :  

                   -p : show pids

                   -a : show ommand line arguments

                   -u : show uid transitions

                   -l : don't truncate long lines