Add user script to upgrade nnn on Debian 9 Stretch

scripts/user-scripts/upgrade.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# Description: Check and update to latest version of nnn manually on Debian 9 Stretch
+#
+# Shell: bash
+# Author: Arun Prakash Jana
+# NOTE: This script installs a package, should be issued with admin privilege
+
+cur=`nnn -v`
+new=`curl -s "https://github.com/jarun/nnn/releases/latest" | grep -Eo "[0-9]+\.[0-9]+"`
+
+if [ $cur_ver == $new_ver ]; then
+    echo 'Already at latest version'
+    exit 0
+fi
+
+# get the package
+wget "https://github.com/jarun/nnn/releases/download/v$new/nnn_$new-1_debian9.amd64.deb"
+
+# install it
+dpkg -i nnn_$new-1_debian9.amd64.deb
+
+# remove the file
+rm -rf nnn_$new-1_debian9.amd64.deb