How to run command as different user

su -s /bin/bash -c "/usr/bin/echo -n foo" -g apache apache

• -s /bin/bash overrides nologin and allows to interpret value of -c option
• -c "/usr/bin/echo -n foo" allows to avoid using dash-starting first argument

sudo to the rescue!

sudo -u <user> -g <group> -- echo -n foo