The manual page for cron says "When executing commands, any output is mailed to the owner of the crontab". This output will by default found in the ~/mbox file. That might come handy.


While probably unrelated to this issue, when dealing with anything graphical and sometimes even without any apparent reason with silly programs you get output like "Error opening display!" which can be mitigated by setting the DISPLAY variable. (usually to :0)

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