Sites may choose to execute a customized cleanup script following a Yohkoh installation. Common uses for this could be to set file protections, ownerships, group access etc. (chmod, chown, chgrp). It is possible to have such a script run automatically as part of the installation/upgrade procedure by naming the script $ys/site/script/ys_install.local. If this file exists, the Yohkoh Installation scripts will source it following the successful completion of an upgrade and/or installation. It is up to the local manager to verify that all commands within this script have the correct syntax. For example, if chown commands are issued, then the Yohkoh installation procedure would have to be run from the root account to have these take effect.