I'm having to maintain some code and ran across the following line:

echo $CMD | at now +1 minute > /tmp/send.cron 2>&1

From what I can tell it's taking the command defined in $CMD and sending it to a cron job.. my guess is that it's adding 1 minute to now for the command to fire off. But what does the 2>$1 mean? If I'm way off here, jump in!

 

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It redirects stderr (2) to stdout (1). The ampersand (& is used as a prefix to indicate that the "1" is a file descriptor rather than a file name.

 

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I have no idea what the hell Dark just said, but I'm going to agree with him since he agreed with me in another thread. Might as well start the new year out right.

 

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Interesting, are the assumptions I made about the rest correct?

 

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For the most part.

$CMD goes to stdout (one minute from when the command gets submitted)
stderr goes to stdout
stdout goes to /tmp/send.cron

If you're new to UNIX shell, look up i/o redirection.

 

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