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I have a bash script that runs periodically once a day using crontab.

The script checks a condition, and if true, it should issue an at command at a specific time.

at 14:10 <notify-send hello>

The question is: how can I add a specific command like notify-send to the at command?

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echo "notify-send 'hello'" | at 14:10

at is expecting a command from STDIN.

If you want to silence the /bin/sh warning, run it this way:

echo "notify-send 'hello'" | at 14:10 2>/dev/null
  • I am testing your command I see this error warning: commands will be executed using /bin/sh, what does it mean? – George Udosen Jun 12 '17 at 12:37
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    This means literally what is said. /bin/sh will be used as a shell for the command. It is OK if you are worried. – Pilot6 Jun 12 '17 at 12:39
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    @George I added how to silence the warning. – Pilot6 Jun 12 '17 at 12:44
  • ok but I prefer to see it in case I did something dumb :) – George Udosen Jun 12 '17 at 12:45
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    This is useless use of echo and pipe. A Here String would be more appropriate: at 14:10 <<< "notify-send hello". – Ruslan Jun 12 '17 at 12:53

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