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Upload file to remote server using SCP
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usually not necessary to use the -P 22 argument; scp uses port 22 by default. on the other end it isn't necessary to include the full filename, but the path only--unless you want to name the file something else on the remote target, in which case you'd use a different name.
Last point: you shouldn't be passing files around as or logging in remotely with a privileged account in almost EVERY case. Root login should be disabled on the remote host as a best practice.
Other than these things, the command is completely correct.