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chgrp : Operation not permitted?

I have this simple line of code:

      mkdir($path_to_rpi, 0755);
      chgrp($path_to_rpi, 'sambashare');

Directory is created as www-data and group is the same. www-data owns the directory and yet the chgrp fails?!?

What am I missing here?

Solution

  • Confirming my comment:

    You must be a member of the group to which you are changing ownership to.

    http://unixhelp.ed.ac.uk/tasks/change_own.html

    (dead link; use this one: https://theory.uwinnipeg.ca/UNIXhelp/tasks/change_own.html)