- You'll want to download Google Chrome Canary. Google explicitly dosen't let you set this as a default browser, but most of the time it's very stable. To set it as your default browser, open up Safari. On the top bar, go to
Safari -> Preferences -> Default Web Browser. Chrome Canary should show up in the list.
Now, your probably coming from Linux. Will most of your command line stuff work? Absolutely. OSX is based of Darwin, which is an offical Unix-like POSIX system. Most things under the hood will work the same, a lot of the GNU tools are already installed. Also, device mounting is a little different, but that's about it.
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First, you'll need your arsenal of general command-line and development tools (clang, git, etc...). The Terminal will prompt you to download XCode Developer Tools when you run a command that comes bundled with it (the prompt is misleading, it does not install the full XCode). So type
git, and accept the prompt. Then wait it out while it downloads. -
Secondly, the default OSX Terminal rather sucks. For this, I recomend iTerm 2. It's nice.
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Now, you'll want your package manager. Use Homebrew. Once you install it, installing packages (called formulas) is as simple as
brew install FORMULA. You can read the man pages for the rest, but it's like pacman's more straight forward and slower brother (I blame Ruby for the slowness).