Linux: Set permissions 644 for files, 755 for directories

From: https://stackoverflow.com/questions/18817744/change-all-files-and-folders-permissions-of-a-directory-to-644-755

The easiest way is to do:

chmod -R u+rwX,go+rX,go-w /foo

which basically means:

to change file modes -Recursively by giving:

• user: read, write and eXecute permissions,
• group and other users: read and eXecute permissions, but not -write permission.

Please note that X will make a directory executable, but not a file, unless it's already searchable/executable.