03-13-2012
scp and rsync are designed to detect that their password input isn't comming from a terminal to stop just this sort of thing.
I would say the developers of these products thought it was a bad thing for account passwords being visible on ps listings or in human readable files.
If you really insist on doing this sort of thing the expect tool is probably the way you will need to go, or just setup public/private key authentication between the accounts (it's not that hard and will be much more portable/safe).
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