diff --git a/OSX/mk-high-sierra-1013-bootable-iso.sh b/OSX/mk-high-sierra-1013-bootable-iso.sh
new file mode 100644
index 0000000..f366b26
--- /dev/null
+++ b/OSX/mk-high-sierra-1013-bootable-iso.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# failexit.mrg
+function failexit () {
+  echo '! Something failed! Code: '"$1 $2" # code # (and optional description)
+  exit $1
+}
+
+
+dest=/Volumes/zmac5int/zmac5intcompshr
+
+cd $dest || failexit 101 "check $dest"
+
+time hdiutil create -o HighSierra.cdr -size 6000m -layout SPUD -fs HFS+J && \
+  hdiutil attach HighSierra.cdr.dmg -noverify -mountpoint /Volumes/install_build
+
+sudo $HOME/Downloads/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build
+
+mv -v HighSierra.cdr.dmg HighSierra.dmg
+
+hdiutil detach /Volumes/Install\ macOS\ High\ Sierra
+hdiutil detach /Volumes/install_build
+
+time hdiutil convert HighSierra.dmg -format UDTO -o HighSierra.iso && mv -v HighSierra.iso.cdr HighSierra.iso
+date
+ls -alh *.iso