Permission sever chmod

command.sh

cd /var/www/image
#For file like image you don't need execution permission :

sudo chmod 664 *
#If you have directories inside image and you want to apply permission :

sudo find . -type d -exec chmod 755 "{}" \;
#This will recursively search your directory and chmod 755 all directories only.

#Similarly, the following will chmod all files only (and ignore the directories):

sudo find . -type f -exec chmod 644 "{}" \;
#File name with space case (thanks to Nicklas B)

find . -type f -print0 | xargs -0 chmod 644