$ sudo chown -R user:group /path/to/directory/or/file
c : create
x : extract
v : verbose output
z : –gzip, –gunzip, –ungzip filter the archive through gzip
f : use the following file for archive
$ cd /path/to/directory/contains/files
$ tar cvzf file_name.tar.gz *
$ tar xvzf file_name.tar.gz
$ sudo killall unity-panel-service