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I am trying to do a rsync from amazon cloud to my local machine by using php.

I have

$copy = 'rsync -acz .'

shell_exec ($copy)

However, the file is not copied and there is no error message as well. Can anyone give me a hint about it? Thanks so much!

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Have you tried running it from the shell command line? What was the result? – Kyle Jones Apr 20 '13 at 1:09
I believe there may be an error message on STDERR, this would possibly end up in your web servers' error log, and not in the page output as STDOUT might. – dlamblin Apr 20 '13 at 1:48
what ssh key are you using? Is it asking for a password or have you set it up with a keychain / passwordless login? Remember I had a similar issue a while ago that was solved with using keychain. – James Apr 20 '13 at 8:36
is rsync in th path? which rsync may be /bin/rsync should work better in script? – Yurij73 Apr 20 '13 at 13:00

There are a few things that could be going wrong here. First of all, you are missing a semi colon at the end of the $copy variable declaration. Your script should be

$copy = 'rsync -acz user@server:/home/user/foo.txt .';
shell_exec ($copy);

If that is just a typo in your post and not the way the real script is, make sure you can run the command correctly from a terminal, without needing to enter a password. If you can, launch your php script again but monitor your error logs. Assuming you are running this script through a an apache webserver, that would be

tail -f /var/log/apache2/error.log
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