tar command to preserve file permissions?

Creating Tar: 

tar -pcvzf xxx.tar.gz ABC

Extracting: 

tar -pxvzf xxx.tar.gz ABC


Where, 
p == preserve permissions
c == create archive
v == verbose (print names while making tar)
z == gzip
f == tar file name

How do I log out another logged in user in ubuntu?

Use command: 

sudo pkill -KILL -u username