Setting permissions for one file/directory to multiple groups in Linux

This post is a summary of (workaround) methods to have a file/directory owned by multiple Linux groups with traditional Unix permissions. Access Control Lists¬†(ACL) Each file or directory can only have one group as owner,¬†but permissions can be defined for other groups using ACL. If your system hasn’t ACL installed, install the command line tools which are in the acl package with: sudo apt-get install acl Then with getfacl you can read the