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  • I'm guessing that your NOSUCHVARIABLE is supposed to represent the environment variable I set in the crontab: RUN_BY_CRON ??? Commented Jan 20 at 3:27
  • Yes; it's an example of a variable that wouldn't normally exist. Commented Jan 20 at 3:49
  • OK - thanks. I've just done a quick test using RUN_BY_CRON=${RUN_BY_CRON-""}. That seems to be all I need in my case. AFAIC, this is a correct answer --- and the accepted answer :) Commented Jan 20 at 3:53
  • Just one other thing: Do you have a link to the GNU docs on this technique?... Is this it? Commented Jan 20 at 4:22
  • 1
    @Seamus It's in POSIX, so you can look there. Commented Jan 20 at 5:15