STATA portable code with mkdir

So, I'm trying to write a line of that will check if there is a directory present, and only try and create a directory if that is false. Found this on the STATA list:

local name test_directory
cd C:\
capture confirm file "./`name'/nul" // check if `name' subdir exists
if _rc { // _rc will be >0 if it doesn't exist
    !md "`name'"
    }

// my do file
save "C:/`name'/current_data.dta"  // optionally add -,replace-

Looks pretty solid overall for my application, but I'm struggling with converting it to Mac compatible syntax.

local name test_directory
cd ~/
capture confirm file "./`name'/*" 
// check if `name' subdir exists
if _rc { 
    mkdir "`name'"
    }

Any advice on how to do this right?

Thanks!