diff --git a/setup.sh b/setup.sh
new file mode 100755
index 0000000..178c540
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+set -u # Throw errors when unset variables are used
+set -e # Exit on error
+#set -o pipefail # Bash specific
+
+usage() {
+	echo "Tool to BLAH BLAH BLAH"
+	echo
+	echo "Usage:"
+	echo "$0 [-eh] [-a <arg>] <blabla>"
+	echo
+	echo "-a <arg>  Option with argument"
+	echo "-e        Example option"
+	echo "-h        This help message"
+	exit
+}
+
+askyn() {
+	while true; do
+		printf '%s ' "$1 "
+		read -r yn
+		case $yn in
+			[Yy]* ) return 0;;
+			[Nn]* ) return 1;;
+			* ) echo "Please answer [y]es or [n]o.";;
+		esac
+	done
+}
+
+# A POSIX variable
+OPTIND=1 # Reset in case getopts has been used previously in the shell.
+
+# Initialize our own variables:
+ARGUMENT=""
+EXAMPLE=""
+
+# getopts only allows single letter options (but is apparently the most
+# portable). If you want multi letter options (eg --help) use getopt.
+while getopts "hea:" opt; do
+	case "$opt" in
+	a)	ARGUMENT="$OPTARG";;
+	h)
+		usage
+		;;
+	e)	EXAMPLE="-e" ;;
+	?)	exit 1 ;; # message provided by getopts
+	esac
+done
+
+shift $((OPTIND-1))
+
+[ $# -ge 1 ] && [ "$1" = "--" ] && shift
+
+MYDIR=$(dirname "$(realpath "$0")")
+TESTDIR="${MYDIR}/test"
+
+mkdir -p "${TESTDIR}"
+rm "${TESTDIR}/*"
+touch "${TESTDIR}/aaa"
+touch "${TESTDIR}/bbb"
+touch "${TESTDIR}/ccc"
+touch "${TESTDIR}/ëëë"