diff --git a/src/check-duplicates b/src/check-duplicates
new file mode 100755
index 0000000..ee36a7d
--- /dev/null
+++ b/src/check-duplicates
@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+
+
+# This file is part of scripts.
+
+# scripts is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# scripts is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with scripts.  If not, see <https://www.gnu.org/licenses/>.
+
+# Original author: Maciej Barć <xgqt@protonmail.com>
+# Copyright (c) 2021, src_prepare group
+# Licensed under the GNU GPL v3 License
+
+# Fork of 'portdupe' from Gentoo science reporitory, original by omp:
+#   Copyright 2006 David Shakaryan <omp@gentoo.org>
+#   Distributed under the terms of the GNU General Public License v2
+# This one upgrades the license to GNU General Public License v3
+
+
+trap 'exit 128' INT
+export PATH
+
+
+PORTDIR="$(portageq get_repo_path / gentoo)"
+
+
+# If an argument is present, use it as the overlay directory.
+if [ "${1}" ]
+then
+    cd "${1}" || exit 1
+fi
+
+# Checking, displaying, etc.
+for PACKAGE in */*
+do
+    if [ -d "${PORTDIR}/${PACKAGE}" ] \
+           && [[ $(basename "${PACKAGE}") != "CVS" ]] \
+           && grep -q "$(dirname "${PACKAGE}")" "${PORTDIR}/profiles/categories"
+    then
+        # Reset versions from last package checked.
+        PORTPACK_VERS=""
+        OVERPACK_VERS=""
+
+        # Find just package name excluding category.
+        PACKAGE_BASE="$(basename "${PACKAGE}")"
+
+        # Find versions of package in portage.
+        for PORTPACK in $(find "${PORTDIR}/${PACKAGE}" -name "*.ebuild" | sed -e 's/.ebuild//')
+        do
+            PORTPACK_VER="$(basename "${PORTPACK}" | sed "s/${PACKAGE_BASE}-//")"
+            PORTPACK_VERS="${PORTPACK_VERS} ${PORTPACK_VER}"
+        done
+
+        # Find versions of package in overlay.
+        for OVERPACK in $(find "${PACKAGE}" -name "*.ebuild" | sed -e 's/.ebuild//')
+        do
+            OVERPACK_VER="$(basename "${OVERPACK}" | sed "s/${PACKAGE_BASE}-//")"
+            OVERPACK_VERS="${OVERPACK_VERS} ${OVERPACK_VER}"
+        done
+
+        # Output info with colors.
+        echo -e "\e[1;33m${PACKAGE}\e[0m"
+        echo -e "  \e[1;35mPortage:\e[0m${PORTPACK_VERS}"
+        echo -e "  \e[1;35mOverlay:\e[0m${OVERPACK_VERS}"
+    fi
+done