A cool thing to do if you find yourself doing something LOTs of times:
Edit your ".bashrc" (in your home directory)
and create your personalised script as follows:
wch() { sudo chmod 774 $1 $2 $3 $4; sudo chown www-data.www-data $1 $2 $3 $4; }
Then you can execute the command "wch" with parameters to execute the commands you want. Very cool...