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  • In what directory is your tree.test file located and what are the permissions and ownerships of that directory? If it's in your home directory, you also seem to have some sort of extended attribute set on it (the final . in the permission string). Commented Dec 10, 2019 at 18:55
  • in /home/achille; perm = 700 as stated, file has 644 perm. Commented Dec 10, 2019 at 19:15
  • What is the result of lsattr tree.test? (by the way, you can change the group of a file you own to anyone of your groups, unless you are using extended attributes OR the filesystem you are working on does not allow it). Commented Dec 10, 2019 at 20:36
  • Please add output of groups no arguments. Commented Dec 10, 2019 at 22:33
  • These are admin tools pretty explicitly. A user doesn't assign groups to themselves. As an example if a user could assign themselves to wheel they'd gain root privileges through sudo on many systems. These days it's so easy to set up a personal linux box or VM running linux that there's no reason not to learn the admin tools. Commented Dec 10, 2019 at 22:47