If you're new to Mac, and you need to write shell scripts to achieve a certain functionality, you might want to learn bash, e.g. OS X uses the famous bash as its default shell and – with Terminal.app – offers a typical Terminal emulator similar to those found in all graphical Linux/Unix distributions.
You therefore can't just run a batch file or typical DOS commands on Mac OS X. Mac OS X is essentially based on Unix and therefore has nothing or little in common with MS DOS.
