With the exception of which, which has a better Perl equivalent called pwhich, you should try http://unxutils.sourceforge.net/ as standalone alternative for cygwin.
Quote from description:

Here are some ports of common GNU utilities to native Win32. In this context, native means the executables do only depend on the Microsoft C-runtime (msvcrt.dll) and not an emulation layer like that provided by Cygwin tools.

But nevertheless you run into problems with find and echo as they have DOS equivalents commands with the same name, but limited functionality. If you have Novell, you will hit e.g. ls, depending on your path.