[Desire Android Development] baadnewz:
copy_dir PACKAGE:SDEXT SDEXT:----------mount("ext4","/dev/block/mmcblk0p2","/sd-ext");
.......................................package_extract_dir("sdext", "/sd-ext");

this code only works on ext3 or ext4 i think the chef who is creating an updater-script should specify this. for ext2 you need to mount it as ext2, you can also try "auto" but might encounter issues with the recovery running kernel, and other stuff

only ext3 can be mounted as ext4 and vice-versa

also for ease of use I will provide the symlinking from my updater-script for toolbox and busybox since is pretty unhandy to write them - should apply to any toolbox and busybox version

ui_print("-Creating toolbox symlinks");
symlink("toolbox", "/system/bin/chownto", "/system/bin/getevent", "/system/bin/getprop", "/system/bin/ifconfig", "/system/bin/iftop", "/system/bin/ioctl", "/system/bin/log", "/system/bin/nandread", "/system/bin/newfs_msdos", "/system/bin/notify", "/system/bin/schedtop", "/system/bin/sendevent", "/system/bin/setprop", "/system/bin/smd", "/system/bin/start", "/system/bin/stop",	"/system/bin/vmstat", "/system/bin/watchprops", "/system/bin/wipe", "/system/bin/top");

ui_print("-Creating busybox symlinks");
symlink("/system/xbin/busybox", "/system/xbin/[", "/system/xbin/[[", "/system/xbin/addgroup", "/system/xbin/adduser", "/system/xbin/adjtimex", "/system/xbin/ar", "/system/xbin/arp", "/system/xbin/arping", "/system/xbin/ash", "/system/xbin/awk", "/system/xbin/basename", "/system/xbin/bbconfig", "/system/xbin/beep", "/system/xbin/blkid", "/system/xbin/brctl", "/system/xbin/bunzip2", "/system/xbin/bzcat", "/system/xbin/bzip2", "/system/xbin/cal", "/system/xbin/cat", "/system/xbin/catv", "/system/xbin/chat", "/system/xbin/chattr", "/system/xbin/chgrp", "/system/xbin/chmod", "/system/xbin/chown", "/system/xbin/chpasswd", "/system/xbin/chpst", "/system/xbin/chroot", "/system/xbin/chrt", "/system/xbin/chvt", "/system/xbin/cksum", "/system/xbin/clear", "/system/xbin/cmp", "/system/xbin/comm", "/system/xbin/cp", "/system/xbin/cpio", "/system/xbin/crond", "/system/xbin/crontab", "/system/xbin/cryptpw", "/system/xbin/cttyhack", "/system/xbin/cut", "/system/xbin/date", "/system/xbin/dc", "/system/xbin/dd", "/system/xbin/deallocvt", "/system/xbin/delgroup", "/system/xbin/deluser", "/system/xbin/depmod", "/system/xbin/devmem", "/system/xbin/df", "/system/xbin/diff", "/system/xbin/dirname", "/system/xbin/dmesg", "/system/xbin/dnsd", "/system/xbin/dnsdomainname", "/system/xbin/dos2unix", "/system/xbin/du", "/system/xbin/dumpkmap",	"/system/xbin/echo", "/system/xbin/ed", "/system/xbin/egrep", "/system/xbin/eject", "/system/xbin/env", "/system/xbin/envdir", "/system/xbin/envuidgid", "/system/xbin/ether-wake", "/system/xbin/expand", "/system/xbin/expr",	"/system/xbin/fakeidentd", "/system/xbin/false", "/system/xbin/fbset", "/system/xbin/fbsplash", "/system/xbin/fdflush", "/system/xbin/fdformat", "/system/xbin/fdisk", "/system/xbin/fgrep", "/system/xbin/find", "/system/xbin/findfs", "/system/xbin/fold", "/system/xbin/free", "/system/xbin/freeramdisk", "/system/xbin/fsck", "/system/xbin/fsck.minix", "/system/xbin/fsync", "/system/xbin/ftpd", "/system/xbin/ftpget", "/system/xbin/ftpput", "/system/xbin/fuser", "/system/xbin/getopt", "/system/xbin/getty", "/system/xbin/grep", "/system/xbin/gunzip", "/system/xbin/gzip", "/system/xbin/halt", "/system/xbin/hd", "/system/xbin/hdparm", "/system/xbin/head", "/system/xbin/hexdump", "/system/xbin/hostid", "/system/xbin/hostname", "/system/xbin/httpd", "/system/xbin/hush", "/system/xbin/hwclock", "/system/xbin/id", "/system/xbin/ifdown", "/system/xbin/ifenslave", "/system/xbin/ifplugd", "/system/xbin/ifup", "/system/xbin/inetd", "/system/xbin/init", "/system/xbin/insmod", "/system/xbin/install", "/system/xbin/ionice", "/system/xbin/ip", "/system/xbin/ipaddr", "/system/xbin/ipcalc", "/system/xbin/ipcrm", "/system/xbin/ipcs", "/system/xbin/iplink", "/system/xbin/iproute", "/system/xbin/iprule", "/system/xbin/iptunnel", "/system/xbin/kbd_mode", "/system/xbin/kill", "/system/xbin/killall", "/system/xbin/killall5", "/system/xbin/klogd", "/system/xbin/last", "/system/xbin/length", "/system/xbin/less", "/system/xbin/linux32", "/system/xbin/linux64", "/system/xbin/linuxrc", "/system/xbin/ln", "/system/xbin/loadfont", "/system/xbin/loadkmap", "/system/xbin/logger", "/system/xbin/login", "/system/xbin/logname", "/system/xbin/logread", "/system/xbin/losetup", "/system/xbin/lpd", "/system/xbin/lpq", "/system/xbin/lpr", "/system/xbin/ls", "/system/xbin/lsattr", "/system/xbin/lsmod", "/system/xbin/lzmacat", "/system/xbin/lzop", "/system/xbin/lzopcat", "/system/xbin/makedevs", "/system/xbin/makemime", "/system/xbin/man", "/system/xbin/md5sum", "/system/xbin/mdev", "/system/xbin/mesg", "/system/xbin/microcom", "/system/xbin/mkdir", "/system/xbin/mkdosfs", "/system/xbin/mkfifo", "/system/xbin/mkfs.minix", "/system/xbin/mkfs.vfat", "/system/xbin/mknod", "/system/xbin/mkpasswd", "/system/xbin/mkswap", "/system/xbin/mktemp", "/system/xbin/modprobe", "/system/xbin/more", "/system/xbin/mount", "/system/xbin/mountpoint", "/system/xbin/msh", "/system/xbin/mt", "/system/xbin/mv", "/system/xbin/nameif", "/system/xbin/nc", "/system/xbin/netstat", "/system/xbin/nice", "/system/xbin/nmeter", "/system/xbin/nohup", "/system/xbin/nslookup", "/system/xbin/od", "/system/xbin/openvt", "/system/xbin/passwd", "/system/xbin/patch", "/system/xbin/pgrep", "/system/xbin/pidof", "/system/xbin/ping", "/system/xbin/ping6", "/system/xbin/pipe_progress", "/system/xbin/pivot_root", "/system/xbin/pkill", "/system/xbin/popmaildir", "/system/xbin/poweroff", "/system/xbin/printenv", "/system/xbin/printf", "/system/xbin/ps", "/system/xbin/pscan", "/system/xbin/pwd", "/system/xbin/raidautorun", "/system/xbin/rdate", "/system/xbin/rdev", "/system/xbin/readahead", "/system/xbin/readlink", "/system/xbin/readprofile", "/system/xbin/realpath", "/system/xbin/reformime", "/system/xbin/renice", "/system/xbin/reset", "/system/xbin/resize", "/system/xbin/rm", "/system/xbin/rmdir", "/system/xbin/rmmod", "/system/xbin/route", "/system/xbin/rtcwake", "/system/xbin/run-parts", "/system/xbin/runlevel", "/system/xbin/runsv", "/system/xbin/runsvdir", "/system/xbin/rx", "/system/xbin/script", "/system/xbin/scriptreplay", "/system/xbin/sed", "/system/xbin/sendmail", "/system/xbin/seq", "/system/xbin/setarch", "/system/xbin/setconsole", "/system/xbin/setfont", "/system/xbin/setkeycodes", "/system/xbin/setlogcons", "/system/xbin/setsid", "/system/xbin/setuidgid", "/system/xbin/sha1sum", "/system/xbin/sha256sum", "/system/xbin/sha512sum", "/system/xbin/showkey", "/system/xbin/slattach", "/system/xbin/sleep", "/system/xbin/softlimit", "/system/xbin/sort", "/system/xbin/split", "/system/xbin/start-stop-daemon", "/system/xbin/stat", "/system/xbin/strings", "/system/xbin/stty", "/system/xbin/sulogin", "/system/xbin/sum", "/system/xbin/sv", "/system/xbin/svlogd", "/system/xbin/swapoff", "/system/xbin/swapon", "/system/xbin/switch_root", "/system/xbin/sync", "/system/xbin/sysctl", "/system/xbin/syslogd", "/system/xbin/tac", "/system/xbin/tail", "/system/xbin/tar",	"/system/xbin/tcpsvd", "/system/xbin/tee", "/system/xbin/telnet", "/system/xbin/telnetd", "/system/xbin/test", "/system/xbin/tftp", "/system/xbin/tftpd", "/system/xbin/time", "/system/xbin/timeout", "/system/xbin/touch", "/system/xbin/tr", "/system/xbin/traceroute", "/system/xbin/true", "/system/xbin/tty",	"/system/xbin/ttysize", "/system/xbin/tunctl", "/system/xbin/udpsvd", "/system/xbin/umount", "/system/xbin/uname", "/system/xbin/uncompress", "/system/xbin/unexpand", "/system/xbin/uniq", "/system/xbin/unix2dos", "/system/xbin/unlzma", "/system/xbin/unlzop", "/system/xbin/unzip", "/system/xbin/uptime", "/system/xbin/usleep", "/system/xbin/uudecode", "/system/xbin/uuencode", "/system/xbin/vconfig", "/system/xbin/vi", "/system/xbin/vlock", "/system/xbin/volname", "/system/xbin/watch", "/system/xbin/watchdog", "/system/xbin/wc", "/system/xbin/wget", "/system/xbin/which", "/system/xbin/who", "/system/xbin/whoami", "/system/xbin/xargs", "/system/xbin/yes", "/system/xbin/zcat", "/system/xbin/zcip");

also

ui_print("-Creating busybox symlinks");

is pretty self explanatory what is does, prints the text between "" on screen

and as a bonus and ease of use (for my experience show and tell is the best method) this is my updater-script used in the last version of my rom, to see a start to end working updater-script (edify)

#
# Generated by dsixda's HTC Android Kitchen
# xda-developers.com
#
show_progress(0.500000, 0);

ui_print("-Checking Model ID");
assert(getprop("ro.product.device") == "bravo" || getprop("ro.build.product") == "bravo" || getprop("ro.product.board") == "bravo");
ui_print("-Success!");
ui_print("-Model ID - HTC Bravo");
ui_print("-Ok to proceed");
ui_print("Now flashing InsertCoin HD Port 1.8f");
ui_print("Please be patient");
ui_print("1st boot may take a few minutes");

show_progress(0.500000, 40);
ui_print("-Wiping system and cache.");
format("MTD", "cache");
format("MTD", "system");
delete("/data/local");
delete("/data/app");
delete_recursive("/data/data/com.android.vending/cache");

ui_print("-Writing SDEXT");
mount("ext4","/dev/block/mmcblk0p2","/sd-ext");
package_extract_dir("sd-ext", "/sd-ext");

ui_print("-Writing SYSTEM");
mount("MTD", "system", "/system");
package_extract_dir("system", "/system");

show_progress(0.400000, 0);

ui_print("-Creating toolbox symlinks");
symlink("toolbox", "/system/bin/chownto", "/system/bin/getevent", "/system/bin/getprop", "/system/bin/ifconfig", "/system/bin/iftop", "/system/bin/ioctl", "/system/bin/log", "/system/bin/nandread", "/system/bin/newfs_msdos", "/system/bin/notify", "/system/bin/schedtop", "/system/bin/sendevent", "/system/bin/setprop", "/system/bin/smd", "/system/bin/start", "/system/bin/stop",	"/system/bin/vmstat", "/system/bin/watchprops", "/system/bin/wipe", "/system/bin/top");

ui_print("-Creating busybox symlinks");
symlink("/system/xbin/busybox", "/system/xbin/[", "/system/xbin/[[", "/system/xbin/addgroup", "/system/xbin/adduser", "/system/xbin/adjtimex", "/system/xbin/ar", "/system/xbin/arp", "/system/xbin/arping", "/system/xbin/ash", "/system/xbin/awk", "/system/xbin/basename", "/system/xbin/bbconfig", "/system/xbin/beep", "/system/xbin/blkid", "/system/xbin/brctl", "/system/xbin/bunzip2", "/system/xbin/bzcat", "/system/xbin/bzip2", "/system/xbin/cal", "/system/xbin/cat", "/system/xbin/catv", "/system/xbin/chat", "/system/xbin/chattr", "/system/xbin/chgrp", "/system/xbin/chmod", "/system/xbin/chown", "/system/xbin/chpasswd", "/system/xbin/chpst", "/system/xbin/chroot", "/system/xbin/chrt", "/system/xbin/chvt", "/system/xbin/cksum", "/system/xbin/clear", "/system/xbin/cmp", "/system/xbin/comm", "/system/xbin/cp", "/system/xbin/cpio", "/system/xbin/crond", "/system/xbin/crontab", "/system/xbin/cryptpw", "/system/xbin/cttyhack", "/system/xbin/cut", "/system/xbin/date", "/system/xbin/dc", "/system/xbin/dd", "/system/xbin/deallocvt", "/system/xbin/delgroup", "/system/xbin/deluser", "/system/xbin/depmod", "/system/xbin/devmem", "/system/xbin/df", "/system/xbin/diff", "/system/xbin/dirname", "/system/xbin/dmesg", "/system/xbin/dnsd", "/system/xbin/dnsdomainname", "/system/xbin/dos2unix", "/system/xbin/du", "/system/xbin/dumpkmap",	"/system/xbin/echo", "/system/xbin/ed", "/system/xbin/egrep", "/system/xbin/eject", "/system/xbin/env", "/system/xbin/envdir", "/system/xbin/envuidgid", "/system/xbin/ether-wake", "/system/xbin/expand", "/system/xbin/expr",	"/system/xbin/fakeidentd", "/system/xbin/false", "/system/xbin/fbset", "/system/xbin/fbsplash", "/system/xbin/fdflush", "/system/xbin/fdformat", "/system/xbin/fdisk", "/system/xbin/fgrep", "/system/xbin/find", "/system/xbin/findfs", "/system/xbin/fold", "/system/xbin/free", "/system/xbin/freeramdisk", "/system/xbin/fsck", "/system/xbin/fsck.minix", "/system/xbin/fsync", "/system/xbin/ftpd", "/system/xbin/ftpget", "/system/xbin/ftpput", "/system/xbin/fuser", "/system/xbin/getopt", "/system/xbin/getty", "/system/xbin/grep", "/system/xbin/gunzip", "/system/xbin/gzip", "/system/xbin/halt", "/system/xbin/hd", "/system/xbin/hdparm", "/system/xbin/head", "/system/xbin/hexdump", "/system/xbin/hostid", "/system/xbin/hostname", "/system/xbin/httpd", "/system/xbin/hush", "/system/xbin/hwclock", "/system/xbin/id", "/system/xbin/ifdown", "/system/xbin/ifenslave", "/system/xbin/ifplugd", "/system/xbin/ifup", "/system/xbin/inetd", "/system/xbin/init", "/system/xbin/insmod", "/system/xbin/install", "/system/xbin/ionice", "/system/xbin/ip", "/system/xbin/ipaddr", "/system/xbin/ipcalc", "/system/xbin/ipcrm", "/system/xbin/ipcs", "/system/xbin/iplink", "/system/xbin/iproute", "/system/xbin/iprule", "/system/xbin/iptunnel", "/system/xbin/kbd_mode", "/system/xbin/kill", "/system/xbin/killall", "/system/xbin/killall5", "/system/xbin/klogd", "/system/xbin/last", "/system/xbin/length", "/system/xbin/less", "/system/xbin/linux32", "/system/xbin/linux64", "/system/xbin/linuxrc", "/system/xbin/ln", "/system/xbin/loadfont", "/system/xbin/loadkmap", "/system/xbin/logger", "/system/xbin/login", "/system/xbin/logname", "/system/xbin/logread", "/system/xbin/losetup", "/system/xbin/lpd", "/system/xbin/lpq", "/system/xbin/lpr", "/system/xbin/ls", "/system/xbin/lsattr", "/system/xbin/lsmod", "/system/xbin/lzmacat", "/system/xbin/lzop", "/system/xbin/lzopcat", "/system/xbin/makedevs", "/system/xbin/makemime", "/system/xbin/man", "/system/xbin/md5sum", "/system/xbin/mdev", "/system/xbin/mesg", "/system/xbin/microcom", "/system/xbin/mkdir", "/system/xbin/mkdosfs", "/system/xbin/mkfifo", "/system/xbin/mkfs.minix", "/system/xbin/mkfs.vfat", "/system/xbin/mknod", "/system/xbin/mkpasswd", "/system/xbin/mkswap", "/system/xbin/mktemp", "/system/xbin/modprobe", "/system/xbin/more", "/system/xbin/mount", "/system/xbin/mountpoint", "/system/xbin/msh", "/system/xbin/mt", "/system/xbin/mv", "/system/xbin/nameif", "/system/xbin/nc", "/system/xbin/netstat", "/system/xbin/nice", "/system/xbin/nmeter", "/system/xbin/nohup", "/system/xbin/nslookup", "/system/xbin/od", "/system/xbin/openvt", "/system/xbin/passwd", "/system/xbin/patch", "/system/xbin/pgrep", "/system/xbin/pidof", "/system/xbin/ping", "/system/xbin/ping6", "/system/xbin/pipe_progress", "/system/xbin/pivot_root", "/system/xbin/pkill", "/system/xbin/popmaildir", "/system/xbin/poweroff", "/system/xbin/printenv", "/system/xbin/printf", "/system/xbin/ps", "/system/xbin/pscan", "/system/xbin/pwd", "/system/xbin/raidautorun", "/system/xbin/rdate", "/system/xbin/rdev", "/system/xbin/readahead", "/system/xbin/readlink", "/system/xbin/readprofile", "/system/xbin/realpath", "/system/xbin/reformime", "/system/xbin/renice", "/system/xbin/reset", "/system/xbin/resize", "/system/xbin/rm", "/system/xbin/rmdir", "/system/xbin/rmmod", "/system/xbin/route", "/system/xbin/rtcwake", "/system/xbin/run-parts", "/system/xbin/runlevel", "/system/xbin/runsv", "/system/xbin/runsvdir", "/system/xbin/rx", "/system/xbin/script", "/system/xbin/scriptreplay", "/system/xbin/sed", "/system/xbin/sendmail", "/system/xbin/seq", "/system/xbin/setarch", "/system/xbin/setconsole", "/system/xbin/setfont", "/system/xbin/setkeycodes", "/system/xbin/setlogcons", "/system/xbin/setsid", "/system/xbin/setuidgid", "/system/xbin/sha1sum", "/system/xbin/sha256sum", "/system/xbin/sha512sum", "/system/xbin/showkey", "/system/xbin/slattach", "/system/xbin/sleep", "/system/xbin/softlimit", "/system/xbin/sort", "/system/xbin/split", "/system/xbin/start-stop-daemon", "/system/xbin/stat", "/system/xbin/strings", "/system/xbin/stty", "/system/xbin/sulogin", "/system/xbin/sum", "/system/xbin/sv", "/system/xbin/svlogd", "/system/xbin/swapoff", "/system/xbin/swapon", "/system/xbin/switch_root", "/system/xbin/sync", "/system/xbin/sysctl", "/system/xbin/syslogd", "/system/xbin/tac", "/system/xbin/tail", "/system/xbin/tar",	"/system/xbin/tcpsvd", "/system/xbin/tee", "/system/xbin/telnet", "/system/xbin/telnetd", "/system/xbin/test", "/system/xbin/tftp", "/system/xbin/tftpd", "/system/xbin/time", "/system/xbin/timeout", "/system/xbin/touch", "/system/xbin/tr", "/system/xbin/traceroute", "/system/xbin/true", "/system/xbin/tty",	"/system/xbin/ttysize", "/system/xbin/tunctl", "/system/xbin/udpsvd", "/system/xbin/umount", "/system/xbin/uname", "/system/xbin/uncompress", "/system/xbin/unexpand", "/system/xbin/uniq", "/system/xbin/unix2dos", "/system/xbin/unlzma", "/system/xbin/unlzop", "/system/xbin/unzip", "/system/xbin/uptime", "/system/xbin/usleep", "/system/xbin/uudecode", "/system/xbin/uuencode", "/system/xbin/vconfig", "/system/xbin/vi", "/system/xbin/vlock", "/system/xbin/volname", "/system/xbin/watch", "/system/xbin/watchdog", "/system/xbin/wc", "/system/xbin/wget", "/system/xbin/which", "/system/xbin/who", "/system/xbin/whoami", "/system/xbin/xargs", "/system/xbin/yes", "/system/xbin/zcat", "/system/xbin/zcip");

ui_print("-Creating addtional symlinks");
symlink("/system/sd/.customize","/system/customize");
symlink("/system/sd/.etc/slideshow","/system/etc/slideshow");
symlink("/system/sd/.etc/hosts","/system/etc/hosts");
symlink("/system/sd/.lib/VR","/system/lib/VR");
symlink("/system/sd/.lib/libLaputaEngine.so","/system/lib/libLaputaEngine.so");
symlink("/system/sd/.lib/libLaputaLbJni.so","/system/lib/libLaputaLbJni.so");
symlink("/system/sd/.lib/libLaputaLbProviderJni.so","/system/lib/libLaputaLbProviderJni.so");
symlink("/system/sd/.lib/libLaputaLogJni.so","/system/lib/libLaputaLogJni.so");
symlink("/system/sd/.lib/libAdobeReader.so","/system/lib/libAdobeReader.so");
symlink("/system/sd/.lib/libflashplayer.so","/system/lib/libflashplayer.so");
symlink("/system/sd/.lib/libvoicesearch.so","/system/lib/libvoicesearch.so");
symlink("/system/sd/.systemapp/HtcLaputa.apk","/system/app/HtcLaputa.apk");
symlink("/system/sd/.systemapp/HtcLaputaInstaller.apk","/system/app/HtcLaputaInstaller.apk");
symlink("/system/sd/.systemapp/HtcLaputaWidget.apk","/system/app/HtcLaputaWidget.apk");
symlink("/system/sd/.systemapp/LocationPickerLaputa.apk","/system/app/LocationPickerLaputa.apk");
symlink("/system/sd/.systemapp/install_flash_player.apk","/system/app/install_flash_player.apk");
symlink("/system/sd/.systemapp/AdobeReader.apk","/system/app/AdobeReader.apk");
symlink("/system/sd/.systemapp/VoiceSearch.apk","/system/app/VoiceSearch.apk");
symlink("/system/sd/.systemapp/teeter.apk","/system/app/teeter.apk");
symlink("/system/sd/.systemapp/TransferData.apk","/system/app/TransferData.apk");
symlink("/system/sd/.systemapp/BlackBoard.apk","/system/app/BlackBoard.apk");
symlink("/system/sd/.systemapp/Metal.apk","/system/app/Metal.apk");
symlink("/system/sd/.systemapp/Quickoffice.apk","/system/app/Quickoffice.apk");
symlink("/system/sd/.systemapp/Wood.apk","/system/app/Wood.apk");
symlink("/system/sd/.systemapp/Translator.apk","/system/app/Translator.apk");
symlink("dumpstate","/system/bin/bugreport");
symlink("dumpstate","/system/bin/dumpcrash");
symlink("/system/bin/su", "/system/xbin/su");

ui_print("-Setting Permissions");
set_perm_recursive(1000, 1000, 0771, 0644, "/data/local");
set_perm_recursive(1000, 1000, 0771, 0644, "/sd-ext/app");
set_perm_recursive(1000, 1000, 0771, 0644, "/sd-ext/.systemapp");
set_perm_recursive(1000, 1000, 0771, 0644, "/sd-ext/.etc/slideshow");
set_perm_recursive(1000, 1000, 0771, 0644, "/sd-ext/.customize");
set_perm_recursive(0, 0, 0755, 0644, "/system/");
set_perm_recursive(0, 2000, 0755, 0755, "/system/bin");
set_perm(0, 3003, 06755, "/system/bin/ip");
set_perm_recursive(0, 2000, 0755, 0755, "/system/xbin");
set_perm_recursive(0, 2000, 0755, 0755, "/system/etc/init.d");
set_perm(0, 3003, 02755, "/system/bin/netcfg");
set_perm(0, 3004, 02755, "/system/bin/ping");
set_perm(0, 2000, 06750, "/system/bin/run-as");
set_perm_recursive(1002, 1002, 0755, 0440, "/system/etc/bluetooth");
set_perm(0, 0, 0755, "/system/etc/bluetooth");
set_perm(1000, 1000, 0640, "/system/etc/bluetooth/auto_pairing.conf");
set_perm(3002, 3002, 0444, "/system/etc/bluetooth/blacklist.conf");
set_perm(1002, 1002, 0440, "/system/etc/dbus.conf");
set_perm(1014, 2000, 0550, "/system/etc/dhcpcd/dhcpcd-run-hooks");
set_perm(0, 2000, 0550, "/system/etc/init.goldfish.sh");
set_perm(0, 0, 04755, "/system/bin/sysrw");
set_perm(0, 0, 04755, "/system/bin/sysro");
set_perm(0, 0, 06755, "/system/bin/su");
set_perm_recursive(0, 0, 0755, 0555, "/system/etc/ppp");
set_perm_recursive(0, 2000, 0755, 06755, "/system/xbin");
set_perm(0, 0, 04755, "/system/etc/ppp/ip-up-vpn");
set_perm(0, 0, 04755, "/system/xbin/busybox");
set_perm(0, 0, 04755, "/system/bin/toolbox");
set_perm_recursive(0, 2000, 0755, 0755, "/system/etc/init.d");
set_perm_recursive(0, 0, 0755, 0644, "/system/lib/modules, ");
set_perm(0, 2000, 0755, "/system/xbin, ");
set_perm(0, 0, 04777, "/system/bin/e2fsck");
set_perm(0, 0, 04777, "/system/bin/tune2fs");
set_perm_recursive(0, 2000, 0755, 0755, "/system/etc/init.d");
set_perm(0, 2000, 0755, "/system/etc/init.d/40a2sd");
set_perm(0, 2000, 0755, "/system/bin/e2fsck");
set_perm(0, 2000, 0755, "/system/bin/tune2fs");

ui_print("-Running aditional scripts");
run_program("installbusybox");
run_program("move_cache_sd");

show_progress(0.200000, 10);

ui_print("-Writing boot.img");
package_extract_file("boot.img","/tmp/boot.img");
write_raw_image("/tmp/boot.img", "boot");
delete("/tmp/boot.img");

show_progress(0.100000, 0);
ui_print("-Flashing Complete");
ui_print("Welcome to");
ui_print("InsertCoin HD Port 1.8f");
ui_print("Remember that 1st boot will take a while");
ui_print("Do not panic, just wait");
ui_print("If you are getting bootloop");
ui_print("Wipe all then reflash");
unmount("/system");
unmount("/sd-ext");

some are rom specific but take them as examples

Also be very carefully what binary you use since there are some version floating around, and with the update-binary comes the syntax.

For example:

with some versions of binary the mount command

mount("ext4","/dev/block/mmcblk0p2","/sd-ext");

requires 3 parameters

mount("ext3", "EMMC", "/dev/block/mmcblk0p26", "/data");

requires 4 if you use only 3 you'll get some error

This happened to me 2 times already

Maybe other commands have changed syntax with other binaries, this is the only one I have encounter.

Hope all the info helps, I'm pretty unskilled on Edify syntax myself, I think I've spent 1 week to convert from update to updater an create a working script