Greg Wooledge wrote on 7/1/26 8:19 PM:
Without -b, we can deduce that the Kate command line process is sending the edit request to an "already running Kate instance", and then terminating, at which point crontab checks the file, sees no change, and reports the lack of changes, leaving the installed crontab unchanged.
Yes... except that I wasn't using any other instance of kate, so it's still not entirely clear (to me, anyway) why I had to change the value of $VISUAL. [Something to do with the way the editor is invoked by crontab, perhaps?]
I now have this issue filed in my voluminous mental "I don't understand this, but I have other things I need to worry about" file.
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