UNIX permissions

permisions.sh

# Recursively chmod only directories
find . -type d -exec chmod 755 {} \;

# Similarly, recursively set the execute bit on every directory
chmod -R a+X *
#  The +X flag sets the execute bit on directories only

# Recursively chmod only files
find . -type f -exec chmod 644 {} \;

#  Recursively chmod only JS files (with extension .js)
find . -type f -name '*.js' -exec chmod 644 {} \;