start simple http server serve static files in the current directory

http_server.sh

#!/bin/sh

function http_server() {
  local PORT=8888
  if [ $# -ne 0 ]; then
    expr $1 + 1 > /dev/null 2>&1
    if [ $? -lt 2 ]; then
      PORT=$1
    else
      echo "Usage: http_server <port>"      return 1
    fi
  fi

  local PYVER=`python -V 2>&1 > /dev/null | cut -d' ' -f2`
  if expr $PYVER : "2" > /dev/null; then
    python -m SimpleHTTPServer $PORT
  elif expr $PYVER : "3" > /dev/null; then
    python -m http.server $PORT
  fi
}