When your script is being run by cron, it does not have it's PATH environment variable set up to include the scp command. One way to fix this is to add: 
$ENV{'PATH'} = "/location/of/scp:".$ENV{'PATH'};

[download]
at the top of your script.

In reply to Re: scp fails in cronjob - open3 error by pc88mxer
in thread scp fails in cronjob - open3 error by papai

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