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I've written a bidirectional filesystem synchronization tool, and a content management system, in (nearly) pure bash.

I keep expecting the performance to be terrible but it's surprisingly efficient.

The only thing I've found strongly lacking in bash is math. You can `| bc` all you want, but it still seems slow compared to other languages. I typically do all my math in python (typically through pipes... heh), and everything else in bash.

$(( ))?

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