envuidgid 1 user commands nosh envuidgid set UID, GID, and GIDLIST environment variables then chain envuidgid --primary-group group --supplementary account next-prog envuidgid is a chain-loading utility that sets the UID and GID environment variables to the values for account in the system account database and then chain loads to next-prog with the execvp3 function. envuidgid intentionally does not set the LOGNAME environment variable. It does not deal in login sessions, and is not altering the "login name". If the --primary-group option is used, envuidgid will use group instead of the primary GID of account as the GID value. If the --supplementary option is used, it will also set the GIDLIST environment variable to the (comma-separated) list of supplementary GIDs for the groups to which account belongs, as listed in the groups database. Without that option, it ignores the group database and unsets the GIDLIST environment variable entirely. If it cannot set the environment variables, or cannot find an account named account in the database, it does not chain and exits with status code 111. next-prog may contain its own command line options, which envuidgid will ignore. The main purpose of envuidgid is to eliminate the need for a process that has run chroot1 to read from the system account database. Instead of running setuidgid1 and thus forcing the need for a copy of the system password database inside the changed root environment, a chain runs envuidgid and can obtain the account information from the environment (or run setuidgid-fromenv1) later. envgid1 setgid-fromenv1 Jonathan de Boyne Pollard