Simply create a new user and a new group: sudo adduser foo Then, change the group of the file: sudo chgrp foo /app/syslog-ng/etc/syslog-ng.conf And add the write permission: sudo chmod 664 /app/syslog-ng/etc/syslog-ng.conf Executing /app/syslog-ng/sbin/syslog-ng should, according to the ...