diff --git a/update_jars.sh b/update_jars.sh
new file mode 100755
index 0000000..5b11ab0
--- /dev/null
+++ b/update_jars.sh
@@ -0,0 +1,77 @@
+#!/bin/bash
+
+set -e        # fail on errors
+DRY="echo"    # default to dry mode unless -f is specified
+
+if [[ "$1" == "-f" ]]; then
+  DRY=""
+fi
+
+# Define projects to build and files to copy.
+function list_projects() {
+  add_project manifmerger
+  add_project jobb etc/jobb etc/jobb.bat
+}
+
+# ----
+# List of targets to build, e.g. :jobb:jar
+BUILD_LIST=""
+# List of files to copy. Syntax: relative/dir (relative to src & dest) or src/rel/dir|dst/rel/dir.
+COPY_LIST=""
+
+function add_project() {
+  # $1=project name
+  # $2...=optional files to copy (relative to project dir)
+  local proj=$1
+  echo "## Getting properties for project $proj"
+  # Request to build the jar for that project
+  BUILD_LIST="$BUILD_LIST :$proj:jar"
+  # Copy the resulting JAR
+  local dst=$proj/$proj.jar
+  local src=`(cd ../../tools/base ; ./gradlew :$proj:properties | \
+          awk 'BEGIN { B=""; N=""; V="" } \
+               /^archivesBaseName:/ { N=$2 } \
+               /^buildDir:/         { B=$2 } \
+               /^version:/          { V=$2 } \
+               END { print B "/libs/" N "-" V ".jar" }'i )`
+  COPY_LIST="$COPY_LIST $src|$dst"
+
+  # Copy all the optiona files
+  shift
+  while [[ -n "$1" ]]; do
+    COPY_LIST="$COPY_LIST $proj/$1"
+    shift
+  done
+}
+
+function build() {
+  echo
+  if [[ -z "$BUILD_LIST" ]]; then
+    echo "Error: nothing to build."; exit 1;
+  else
+    echo "## Building $BUILD_LIST"
+    ( cd ../../tools/base ; ./gradlew $BUILD_LIST )
+  fi
+}
+
+function copy_files() {
+  echo
+  if [[ -z "$COPY_LIST" ]]; then
+    echo "Error: nothing to copy."; exit 1;
+  else
+    for f in $COPY_LIST; do
+      src="${f%%|*}"    # strip part after  | if any
+      dst="${f##*|}"    # strip part before | if any
+      if [[ ${src:0:1} != "/" ]]; then src=../../tools/base/$src; fi
+      $DRY cp -v $src $dst
+    done
+    if [[ -n $DRY ]]; then
+      echo
+      echo "## WARNING: DRY MODE. Run with -f to actually copy files."
+    fi
+  fi
+}
+
+list_projects
+build
+copy_files