How do I do set /a on Wine CMD?

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http://askubuntu.com – How do I use the set /a command on the Wine version of CMD? This doesn't work for me on Ubuntu 12.04 LTS: set /a option=1+1 echo %option% On a Windows computer it would output 2 on the screen but in the Wine version it just outputs whether Echo is on or not. How do I fix this? (HowTos)