Debian 9 give User permission for all folders

To give a user (e.g. bob) read-permission for all folder in the /tmp/myfiles-directory:

1.) install acl:

sudo apt-get install acl (after running apt-get update)

2.) give the user “bob” read-permission for eveything in (and including) the /tmp/myfiles-directory:

setfacl -m user:bob:r -R /tmp/myfiles

3.) view the permissions on /tmp/myfiles with:

getfacl /tmp/myfiles

To answer the specific case of giving read/write/execute-permissions to everything (although: DONT EVER DO this!!!)
set eveything inside root to
setfacl -m user:bob:rwx -R /