newgrp is a convienient command I ran across today. You can run this command
after you add your user to a group. This allows you to continue without having
to logout and log back in for the group changes to take effect.
Here is the man page:
Manual page newgrp(1) line 1/28 (END) (press h for help or q to quit)...skipping... NEWGRP(1) User Commands NEWGRP(1) NAME newgrp - log in to a new group SYNOPSIS newgrp [group] DESCRIPTION newgrp changes the group identification of its caller, analogously to login(1). The same person remains logged in, and the current directory is unchanged, but calculations of access permissions to files are performed with respect to the new group ID. If no group is specified, the GID is changed to the login GID. FILES /etc/group /etc/passwd SEE ALSO login(1), group(5) AUTHOR Originally by Michael Haardt. Currently maintained by Peter Orbaek (email@example.com). AVAILABILITY The newgrp command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/. util-linux