chmod all directories or files recursively

chmod_recursively.sh

# To recursively give directories read&execute privileges:
find /path/to/base/dir -type d -exec chmod 755 {} +

# To recursively give files read privileges:
find /path/to/base/dir -type f -exec chmod 644 {} +

# Or, if there are many objects to process:
chmod 755 $(find /path/to/base/dir -type d)
chmod 644 $(find /path/to/base/dir -type f)

# Or, to reduce chmod spawning:
find /path/to/base/dir -type d -print0 | xargs -0 chmod 755 
find /path/to/base/dir -type f -print0 | xargs -0 chmod 644