- find /etc/config /etc/passwd /etc/group /etc/dropbear \
- /etc/firewall.user /etc/rc.local -type f > "$file"
+ ( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
+ /etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
+ -type f 2>/dev/null;
+ opkg list-changed-conffiles ) | sort -u > "$file"