Give specific user permission to write to a folder using +w notation

I know I can assign the permission to write to an owner/group/others like this:

chmod u+w myfolder

Can I specify the specific user here? Some like this:

chmod username u+w myfolder

You could use setfacl:

setfacl -m u:username:rwx myfolder

This sets permissions for specific users, without changing the ownership of the directory.

Check out the man page for further details and examples.

Note:

• setfacl is short for set File ACL (Access Control List)

• If you want to apply it recursively to all the subdirectories: add the -R flag like this:

  setfacl -R -m u:username:rwx myfolder
  

If you want to change the user owning this file or directory (folder), you will have to use the command chown. For instance, if you run

sudo chown username: myfolder

the user owning myfolder will be username. Then you can execute

sudo chmod u+w myfolder

to add the write permission to the username user.

But if you want to add this user to the group associated with "myfolder", you can run

sudo usermod -a -G groupname username

and then execute

sudo chmod g+w myfolder

to add the write permission to the group.