Ok, thanks - I get it. So in this example: ## Is Foo installed? ## if [[ -d "$3/Applications/Foo.app" ]] ; then Where is $3 coming from? I understand that $1 $2 $3 etc. are positional variables. Thanks, - Stephen On 3/28/17 2:52 PM, "Stephane Sudre" <dev.iceberg@gmail.com> wrote:

On Tue, Mar 28, 2017 at 11:30 PM, Mike Solin <mike@mikesolin.com> wrote:

...

It¹s built-in to the shell. See 'man bash'.

On Tue, Mar 28, 2017 at 2:28 PM, Stephen Kay <sk@karma-lab.com> wrote:

...

Thanks for the example! Excuse my ignorance, but what does '-d' command do? I've been trying to search for info on this, related to shell-scripting, but couldn't find anything.

To avoid reading more than 10 pages of the bash man pages to find the answer:

http://stackoverflow.com/questions/59838/check-if-a-directory-exists-in-a- shell-script

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