diff --git a/pkg/de-p1st-repo/PKGBUILD b/pkg/de-p1st-repo/PKGBUILD
index 1438825..1ccf1c5 100644
--- a/pkg/de-p1st-repo/PKGBUILD
+++ b/pkg/de-p1st-repo/PKGBUILD
@@ -2,7 +2,7 @@
 _pkgname=repo
 _reponame=arch-pkg
 pkgname="de-p1st-$_pkgname"
-pkgver=0.1.0
+pkgver=0.1.1
 pkgrel=1
 pkgdesc="Bash script to manage remote Arch Linux repository"
 arch=('any')
@@ -28,6 +28,7 @@ package() {
 
   install -Dm0555 arch-repo-push-new.sh    "$pkgdir"/usr/bin/arch-repo-push-new
   install -Dm0555 arch-repo-receive-new.sh "$pkgdir"/usr/bin/arch-repo-receive-new
+  install -Dm0555 arch-repo-vercmp.sh      "$pkgdir"/usr/bin/arch-repo-vercmp
 
   install -Dm0644 arch-repo.cfg            "$pkgdir"/etc/de-p1st-repo/arch-repo.cfg
   chown 0:0                                "$pkgdir"/etc/de-p1st-repo/arch-repo.cfg
diff --git a/pkg/de-p1st-repo/README.md b/pkg/de-p1st-repo/README.md
index d8dd72f..ab85343 100644
--- a/pkg/de-p1st-repo/README.md
+++ b/pkg/de-p1st-repo/README.md
@@ -34,3 +34,7 @@ Server = https://arch.p1st.de
 2. Push new packages to remote repository
 
 * `arch-repo-push-new`
+
+3. Check for AUR updates
+
+* `arch-repo-vercmp`
\ No newline at end of file
diff --git a/pkg/de-p1st-repo/arch-repo-push-new.sh b/pkg/de-p1st-repo/arch-repo-push-new.sh
index fef2ac8..8332a3e 100644
--- a/pkg/de-p1st-repo/arch-repo-push-new.sh
+++ b/pkg/de-p1st-repo/arch-repo-push-new.sh
@@ -6,9 +6,19 @@ source /etc/de-p1st-repo/arch-repo.cfg || exit
 
 cd "${LOCAL_PKG_DIR}" || exit
 
+# get list of new packages, one package per line
+rsync --ignore-existing --out-format="%n" --dry-run \
+  ./*.pkg.tar.{xz,zst} "${REMOTE_SSH_HOST}":"${REMOTE_PKG_DIR}" > new-pkg.txt || exit
+
+
 # transfer new packages using rsync
 rsync --ignore-existing --progress --human-readable \
   ./*.pkg.tar.{xz,zst} "${REMOTE_SSH_HOST}":"${REMOTE_PKG_DIR}" || exit
 
+# transfer new-pkg.txt
+rsync --ignore-times --checksum --progress --human-readable \
+  new-pkg.txt "${REMOTE_SSH_HOST}":"${REMOTE_PKG_DIR}" || exit
+
+
 # add each new package to database
-ssh "${REMOTE_SSH_HOST}" "/usr/bin/arch-repo-receive-new"
+ssh "${REMOTE_SSH_HOST}" "/usr/bin/arch-repo-receive-new" || exit
diff --git a/pkg/de-p1st-repo/arch-repo-receive-new.sh b/pkg/de-p1st-repo/arch-repo-receive-new.sh
index d0a8a28..e07a882 100644
--- a/pkg/de-p1st-repo/arch-repo-receive-new.sh
+++ b/pkg/de-p1st-repo/arch-repo-receive-new.sh
@@ -4,82 +4,154 @@ source /etc/de-p1st-repo/arch-repo.cfg || exit
 
 
 
+function main(){
+  cd "${REMOTE_PKG_DIR}" || return $?
+  add_new_to_db          || return $?
+  generate_index         || return $?
+}
+
+
+#
+# add all packages to database
+#
+function add_all_to_db(){
+  echo "Adding all packages to db ..."
+  sort_all_pkgname_pkgver || return $?
+
+  echo "For each package name: Add latest version to database ..."
+  for PKGNAME in db/*; do
+    PKGNAME=$(basename "${PKGNAME}") || return $? # strip directory and suffix from filename
+    add_to_db "${PKGNAME}" || return $?
+  done
+}
 #
 # add new packages to database
 #
-function add_to_db(){
+function add_new_to_db(){
   echo "Adding new packages to db ..."
+  sort_new_pkgname_pkgver || return $?
 
-  sort_pkgname_pkgver || return $?
+  echo "For each new package name: Add latest version to database ..."
+  for PKGNAME in "${NEW_PKGNAMES[@]}"; do
+    add_to_db "${PKGNAME}" || return $?
+  done
+}
+#
+# add package to database
+#
+function add_to_db(){
+  # $1: package name
+  local PKGNAME
+  PKGNAME="$1"
 
-  echo "For each package: Add latest version to database ..."
-  for PKGNAME in db/*; do
-    PKGNAME=$(basename "${PKGNAME}")  # strip directory and suffix from filename
+  #
+  # get latest version for $PKGNAME
+  #
 
-    # TODO
-    # db/* -> results in filenames db/FILE1
-    # => remove prefix "db/" to get FILE1
-    # e.g. use filename / basename (!)
+  # pick one random version as starting point for the latest version
+  local LATEST
+  for PKGVER in db/"${PKGNAME}"/*; do
+    PKGVER=$(basename "${PKGVER}")  # strip directory and suffix from filename
+    LATEST="$PKGVER"
+    break
+  done
 
-    #
-    # get latest version for $PKGNAME
-    #
+  local cmp
+  for PKGVER in db/"$PKGNAME"/*; do
+    PKGVER=$(basename "${PKGVER}")  # strip directory and suffix from filename
 
-    local LATEST
-    # pick one random version as starting point for the latest version
-    for PKGVER in db/"${PKGNAME}"/*; do
-      PKGVER=$(basename "${PKGVER}")  # strip directory and suffix from filename
+    # compare the currently known latest version
+    # with the next version
+    cmp=$(vercmp "$LATEST" "$PKGVER") || return $?
+    # if the new version is larger, save it as LATEST
+    if [ "$cmp" -lt "0" ]; then
       LATEST="$PKGVER"
-      break
-    done
+    fi
+  done
 
-    local cmp
-    for PKGVER in db/"$PKGNAME"/*; do
-      PKGVER=$(basename "${PKGVER}")  # strip directory and suffix from filename
+  #
+  # add latest version of PKGNAME to database
+  #
 
-      # compare the currently known latest version
-      # with the next version
-      cmp=$(vercmp "$LATEST" "$PKGVER") || return $?
-      # if the new version is larger, save it as LATEST
-      if [ "$cmp" -lt "0" ]; then
-        LATEST="$PKGVER"
+  PKG=$(cat "db/${PKGNAME}/${LATEST}") || return $?
+  repo-add --new "${REMOTE_DB_NAME}.db.tar.gz" "${PKG}" || return $?
+}
+
+
+#
+# create files "db/$pkgname/$pkgver" with content "$PKG" (path to package file)
+#
+function sort_all_pkgname_pkgver(){
+  echo "Cleanup ..."
+  rm -r db || return $?
+
+  echo "Sorting all packages by package name and package version ..."
+
+  for PKG in *.pkg.tar.{xz,zst}; do
+    sort_pkgname_pkgver "${PKG}" || return $?
+  done
+}
+#
+# create files "db/$pkgname/$pkgver" with content "$PKG" (path to package file)
+#
+function sort_new_pkgname_pkgver(){
+  # return: 0 on success; array $NEW_PKGNAMES
+
+  echo "Sorting new packages by package name and package version ..."
+
+  local NEW_PKGNAMES_TMP=() # list the names from new package-files; may contain duplicates
+
+  mapfile -t PKGS < <(cat new-pkg.txt)
+  for PKG in "${PKGS[@]}"; do
+    sort_pkgname_pkgver "${PKG}" || return $?
+    NEW_PKGNAMES_TMP+=("${PKGNAME}")
+  done
+
+
+  # create array $NEW_PKGNAMES without duplicates
+  NEW_PKGNAMES=()
+  for NEW_PKGNAME_TMP in "${NEW_PKGNAMES_TMP[@]}"; do
+    local contains="0"
+
+    # if NEW_PKGNAMES does already contain NEW_PKGNAME_TMP,
+    # then set contains to "1"
+    for i in "${NEW_PKGNAMES[@]}"; do
+      if [ "${NEW_PKGNAME_TMP}" = "${i}" ]; then
+        contains="1";
+        break;
       fi
     done
 
-    #
-    # add latest version of PKGNAME to database
-    #
-    PKG=$(cat "db/${PKGNAME}/${LATEST}") || return $?
-    repo-add --new "${REMOTE_DB_NAME}.db.tar.gz" "${PKG}" || return $?
-
-    true
+    if [ "${contains}" = "0" ]; then
+      NEW_PKGNAMES+=("${NEW_PKGNAME_TMP}")
+    fi
   done
 }
-
-
 #
-# create files "./db/$pkgname/$pkgver" with content "$path_to_file" = "$PKG"
+# create files "db/$pkgname/$pkgver" with content "$PKG" (path to package file)
 #
 function sort_pkgname_pkgver(){
-  echo "Sorting packages by package name and package version ..."
+  # $1: PKG (path to package file)
+  # return: 0 on success; variables $PKGINFO, $PKGNAME, $PKGVER
+  local PKG
+  PKG="$1"
 
-  for PKG in *.pkg.tar.{xz,zst}; do
-    get_pkginfo "$PKG"        || { echo "get_pkginfo failed"; return 1; }
-    get_pkgname "$PKGINFO"    || { echo "get_pkgname failed"; echo "Content of PKGINFO: ${PKGINFO}"; return 1; }
-    get_pkgver  "$PKGINFO"    || { echo "get_pkgver  failed"; echo "Content of PKGINFO: ${PKGINFO}"; return 1; }
+  get_pkginfo "$PKG"        || { echo "get_pkginfo failed"; return 1; }
+  get_pkgname "$PKGINFO"    || { echo "get_pkgname failed"; echo "Content of PKGINFO: ${PKGINFO}"; return 1; }
+  get_pkgver  "$PKGINFO"    || { echo "get_pkgver  failed"; echo "Content of PKGINFO: ${PKGINFO}"; return 1; }
 
-    echo "Creating file ./db/${PKGNAME}/${PKGVER} with content ${PKG} ..."
-    mkdir -p "db/${PKGNAME}" || return $?
-    echo "${PKG}" > "db/${PKGNAME}/${PKGVER}" || return $?
-  done
+  echo "Creating file ./db/${PKGNAME}/${PKGVER} with content ${PKG} ..."
+  mkdir -p "db/${PKGNAME}" || return $?
+  echo "${PKG}" > "db/${PKGNAME}/${PKGVER}" || return $?
 }
 
+
 #
-# get .PKGINFO
+# get content of .PKGINFO from package-file
 #
 function get_pkginfo(){
   # $1: path to package file
-  # return: 0 on success
+  # return: 0 on success; variable $PKGINFO
 
   if endswith "$1" ".pkg.tar.xz"; then
     PKGINFO=$(tar -xf "$1" -O .PKGINFO --force-local)         || { echo "tar failed"; return 1; }
@@ -96,9 +168,9 @@ function get_pkginfo(){
 # get pkgname from $PKGINFO
 #
 function get_pkgname(){
-    # return: 0 on success; variable $PKGNAME
+  # return: 0 on success; variable $PKGNAME
 
-    # remove "pkgname = " as well as tailing whitespace characters
+  # remove "pkgname = " as well as tailing whitespace characters
   local tmp
   tmp=$(echo "${PKGINFO}" | grep '^pkgname')                     || { echo "grep failed"; return 1; }
   PKGNAME=$(echo "${tmp}" | sed 's|^pkgname\s*=\s*||; s|\s*$||') || { echo "sed failed"; return 1; }
@@ -156,8 +228,4 @@ function generate_index(){
 </html>' >> index.html
 }
 
-
-
-cd "${REMOTE_PKG_DIR}" || exit
-add_to_db              || exit
-generate_index         || exit
+main "$@"
diff --git a/pkg/de-p1st-repo/arch-repo-vercmp.sh b/pkg/de-p1st-repo/arch-repo-vercmp.sh
new file mode 100644
index 0000000..1c90c6c
--- /dev/null
+++ b/pkg/de-p1st-repo/arch-repo-vercmp.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# For all packages in repository $REMOTE_DB_NAME,
+# compare package version with AUR and
+# print all outdated packages
+#
+
+source /etc/de-p1st-repo/arch-repo.cfg || exit
+
+
+
+function main(){
+  echo "Running 'pacman -Sy' ..."
+  sudo pacman -Sy   || return $? # update mirrors -> this will also get the latest version of repository-db $REMOTE_DB_NAME
+
+  all_pkg_vers      || return $?
+  check_aur_updates || return $?
+
+  if [ "${#AUR_UPDATES[@]}" -gt "0" ]; then
+    echo "Repository ${REMOTE_DB_NAME} contains packages with available AUR updates:"
+    for AUR_PKG in "${AUR_UPDATES[@]}"; do
+      echo "  ${AUR_PKG}"
+    done
+  else
+    echo "There are no pending AUR updates in repository ${REMOTE_DB_NAME}."
+  fi
+}
+
+#
+# Store packages from $PKG_VERS with available AUR updates in $AUR_UPDATES.
+# $AUR_UPDATES is an array where each entry describes one outdated package with it's current and new version.
+#
+function check_aur_updates(){
+  mapfile -t AUR_UPDATES < <(echo "$PKG_VERS" | aur vercmp)
+}
+
+#
+# Store all installed package names and their versions
+# from repository $REMOTE_DB_NAME
+# in variable $PKG_VERS.
+# $PKG_VERS consists of multiple lines in the format: "<pkgname><whitespace><pkgver>"
+#
+function installed_pkg_vers(){
+  # The paclist script is partof the package "pacman-contrib"
+  PKG_VERS=$(paclist "${REMOTE_DB_NAME}") || return $?
+}
+
+#
+# Store all package names and their versions
+# from repository $REMOTE_DB_NAME
+# in variable $PKG_VERS.
+# $PKG_VERS contains of multiple lines in the format: "<pkgname><whitespace><pkgver>"
+#
+function all_pkg_vers(){
+  PKG_VERS=$(pacman -S --list "${REMOTE_DB_NAME}" | sed 's|^de-p1st\s*||; s|\s*\[installed.*\]\s*$||') || return $?
+}
+
+main "$@"
diff --git a/pkg/de-p1st-repo/bash-unique-array-test.sh b/pkg/de-p1st-repo/bash-unique-array-test.sh
new file mode 100644
index 0000000..4f90e6f
--- /dev/null
+++ b/pkg/de-p1st-repo/bash-unique-array-test.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+#
+# source: https://stackoverflow.com/a/13649357
+#
+
+a=(aa ac aa ad "ac ad")
+declare -A b
+for i in "${a[@]}"; do b["$i"]=1; done
+
+for i in "${!b[@]}"; do
+  echo ">> $i"
+done