Prozess unter einem anderen Benutzer starten

sudo -H -u otheruser bash -c 'echo "I am $USER, with uid $UID"'

Wobei mit -c erst der eigentlich auszuführende Befehl festgelegt wird

Auszug aus den sudo-Manpages:

-H The -H (HOME) option requests that the security policy set
the HOME environment variable to the home directory of the
target user (root by default) as specified by the password
database. Depending on the policy, this may be the default
behavior.

-u user The -u (user) option causes sudo to run the specified
command as a user other than root. To specify a uid
instead of a user name, use #uid. When running commands as
a uid, many shells require that the '#' be escaped with a
backslash ('\'). Security policies may restrict uids to
those listed in the password database. The sudoers policy
allows uids that are not in the password database as long
as the targetpw option is not set. Other security policies
may not support this.