A more "maccy" way to do it (e.g. for jqt) is simply to duplicate jqt.app and rename the copy to jqt2.app.
This is more attractive to a competent Mac user, who doesn't care to become an expert in the guts of J. It will also work with any app file, though some of them are large (Xcode runs to gigabytes). jqt.app is only 83K, it's nothing but a wrapper to launch /Applications/j64-807/bin/jqt.command I've just reminded myself of the steps, using j807 under El Capitan, and they are as follows: 1. Locate jqt.app -- left-click the green J in the Dock and choose: Options > Show in Finder 2. File > Duplicate it, to give jqt copy.app. Rename it: jqt2.app 3. Drag jqt2.app into the Dock and you have two green Js, which behave like independent apps. HOWEVER there are gotchas… They both use the same *-user folder, and exactly overlay each others' Term and Edit windows. Drag the top window away to see the one underneath -- or click the green J in the Dock that you want. Color the windows differently to distinguish them. It's a challenge to distinguish programmatically which of jqt, jqt2, is actually running a given script. ARGV is no good: it gives <'bin/jqt' for both. You could of course duplicate bin/jqt.command --> bin/jqt2.command and point jqt2.app at it, but that requires brain-surgery on jqt2.app (not hard, but a bit fiddly, and some knowledge of shell-scripting is required). My old solution, if memory serves, was to find the pid (process ID) of the given session in config/startup.ijs and write it into PID_z_. It's several years since I routinely ran second copies of J, so I'll have to ferret out the details if your client is keen to know. I haven't tried doing it with j901 under Catalina. I'd anticipate Gatekeeper or permissions problems, since Catalina is stiff with booby traps for hackers. But the above might still be made to work. On Thu, 23 Apr 2020 at 00:48, chris burke <cbu...@jsoftware.com> wrote: > In macos, clicking a desktop icon for an app that is already running > just gives it focus. > > However, you can load multiple copies of J from the command line, i.e. > something like > > ~/j901/bin/jqt.command > > Equivalently, browse to the J bin folder in Finder and double click > jqt.command. > > On Wed, Apr 22, 2020 at 4:13 PM Henry Rich <henryhr...@gmail.com> wrote: > > > > How do you start two J sessions on a Mac? My client tells me that when > > they click the J icon they get a J session, but when they do it again > > they get nothing. > > > > Henry Rich > > > > -- > > This email has been checked for viruses by AVG. > > https://www.avg.com > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
