Bash is one of those things that you just don't think about all that much – until you want something that is apparently new. In my case I was looking to use the ** syntax which, mysteriously, I found doesn't work at all on OSX (even if you turn it on). This let me to use bash –version.
Here's the result for Linux:
bash --version GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu) Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software; you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
Here's the result for OSX:
bash --version GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin15) Copyright (C) 2007 Free Software Foundation, Inc.
Intellectually I've always known that OSX lagged behind on Open Source tooling but 6 years behind??? Really??? Apparently this is a GPL v3 issue so I get it but sigh.
Upgrading Bash on OSX
I will admit that I am absolutely terrified to try upgrading Bash on OSX since I eat, sleep and breathe in the terminal. The research I've done shows me that you can upgrade your Bash to a version 4 series with just this brew command:
brew install bash
And HomeBrew is awesome so I suspect it works; I'm just chicken.
|More on Upgrading Bash: ClubMate||Stack Overflow|
Sidebar: The ** Syntax Explained
The ** syntax allows the file globbing to operate recursively with a single command. For example:
wc -l **/*.rb
would count all the lines of ruby code across all subdirectories. If you haven't enabled ** then you can do this with:
shopt -s globstar