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I'm used to typing free -m in ubuntu to see how much memory is available, in MB. What's the equivalent command in Mac OSX?

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Since OS X is BSD-based, your best bet will be using sysctl to get the information you need.

sysctl -a | awk '/hw./' && /mem/'

You could also try this:

http://apple.stackexchange.com/questions/4286/is-there-a-mac-os-x-terminal-version-of-the-free-command-in-linux-systems

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Thanks, that's close, the other question has some good suggestions. –  jimbojw Dec 19 '12 at 20:53

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