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#!/bin/bash

case "$OSTYPE" in
    darwin*)  PLATFORM="OSX" ;;
    linux*)   PLATFORM="LINUX" ;;
    bsd*)     PLATFORM="BSD" ;;
    *)        PLATFORM="UNKNOWN" ;;
esac

replace() {
    if [[ "$PLATFORM" == "OSX" || "$PLATFORM" == "BSD" ]]; then
        sed -i "" "$1" "$2"
    elif [ "$PLATFORM" == "LINUX" ]; then
        sed -i "$1" "$2"
    fi
}

replace "s/foo/bar/g" file.txt