On Sat, Jan 18, 2025 at 11:54:53AM -0700, Soren Stoutner wrote: > On Saturday, January 18, 2025 8:41:18 AM MST David Kalnischkies wrote: > > Am Fri, Jan 17, 2025 at 03:29:39PM -0700, schrieb Soren Stoutner: > > > if [ dpkg-divert --list | grep courier-mta ]; then > > Sure, "courier-mta" seems like a string unlikely to appear, but can you > > be sure? [..] > > P.S.: Your grep, if it triggers, also generates output on stdout. > > At least silence it with -q. > > Wouldn’t output on stdout be a good thing, especially if there is ever some > chance this could run when it shouldn’t.
In case anyone hadn't realised: dpkg-divert --list optionally takes an argument which is glob-matched against package name or path name, so you don't need grep and can decide whether you want to insist on a full match or catch more widely, e.g [ -z "$(dpkg-divert --list courier-mta)" ] || ...
