I have downloaded CygWin(32-bit) and installed (on Windows 7 32 bit System) today to run shell script but i found one problem that bc command isn\'
CygWin(32-bit)
Windows 7 32 bit System
I believe that bc is not installed by default on Cygwin, and you will need to install it manually. This link might help you.
bc
DISCLAIMER: I have never used Cygwin.