new file mode 100755
--- /dev/null
+++ b/intl/update-icu.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Usage: update-icu.sh <URL of ICU SVN with release>
+# E.g., for ICU 50.1.1: update-icu.sh http://source.icu-project.org/repos/icu/icu/tags/release-50-1-1/
+
+if [ $# -lt 1 ]; then
+  echo "Usage: update-icu.sh <URL of ICU SVN with release>"
+  exit 1
+fi
+
+icu_dir=`dirname $0`/icu
+rm -rf ${icu_dir}
+svn export $1 ${icu_dir}
+
+# remove layout, tests, and samples, but leave makefiles in place
+find ${icu_dir}/source/layout -name '*Makefile.in' -prune -or -type f -print | xargs rm
+find ${icu_dir}/source/layoutex -name '*Makefile.in' -prune -or -type f -print | xargs rm
+find ${icu_dir}/source/test -name '*Makefile.in' -prune -or -type f -print | xargs rm
+find ${icu_dir}/source/samples -name '*Makefile.in' -prune -or -type f -print | xargs rm
+
+# remove data that we currently don't need
+rm ${icu_dir}/source/data/brkitr/*
+rm ${icu_dir}/source/data/lang/*.mk
+rm ${icu_dir}/source/data/lang/*.txt
+rm ${icu_dir}/source/data/mappings/*.mk
+find ${icu_dir}/source/data/mappings \
+    -name ibm-37_P100-1995.ucm -prune -or \
+    -name ibm-1047_P100-1995.ucm -prune -or \
+    -name '*.ucm' -print | xargs rm
+rm ${icu_dir}/source/data/rbnf/*
+rm ${icu_dir}/source/data/region/*.mk
+rm ${icu_dir}/source/data/region/*.txt
+rm ${icu_dir}/source/data/translit/*
+
+# Record `svn info`
+svn info $1 > ${icu_dir}/SVN-INFO
+
+hg addremove ${icu_dir}