On Fri, Nov 09, 2018 at 04:20:57PM +0000, Jonathan Dowland wrote: > One of dash's design goals is to be a purely POSIX compatible shell*, Not quite. > * they actually *do* implement some carefully defined extensions > according to the man page Yeah. It's not meant to be a litmus test for whether your script refrains from using any extensions. It's not a compliance-testing tool.