#!/bin/sh

if [ $# -eq 0 ]; then
  echo 'No argument found.'
elif [ "$1" '<' m ]; then
  echo "$1 < m"
elif [ "$1" '>' m ]; then
  echo "$1 > m"
else
  echo "$1 = m"
fi

echo

if mkdir mydir; then
  echo 'mkdir done'
else
  echo "mkdir failed, exit code $?"
fi