#!/usr/bin/env bash

if [[ $# -ne 3 ]]; then
  echo "Must have 3 arguments: [FILE] [FROM] [TO]"
fi

FILE=$1
FROM=$2
TO=$3

if [[ $(uname) == "Linux" ]]; then
    sed -i "s,${FROM},${TO},g" ${FILE}
elif [[ $(uname) ==  "Darwin" ]]; then
    sed -i "" "s,${FROM},${TO},g" ${FILE}
else
    echo "Unsupported OS" 2>&1
fi