Documentation update for Mac

[dsowsy]

Trying to run this out of the box fails with

sed: illegal option -- u

The default sed used on Mac is BSD based and doesn't have any version info whatsoever.
If you want to get this working on Mac, will need to use gnu-sed/gsed instead.

[fpedroza]

I myself see the following error

-bash: declare: -A: invalid option

[PokeyTheCat]

I'm a little late to the party but like OP stated you will need the GNU version of sed and an updated version of bash. The sed -u flag lets the screen refresh faster by flushing the buffers faster and loading as little data into buffers (I believe). The declare -A flag allows you to declare associative arrays.

You'll need to run brew install bash and brew install gnu-sed in a command prompt. Then alter the script to use gsed that you just installed instead of sed that is pre-installed.

You may have to follow these instructions on setting up bash on OS X: Upgrading Bash on macOS