By right, a well behaved program should handle the echo only at the necessary 
point: for example, to read password/passphrase, the echo needs be turned off, 
but after that, echo should be recovered to what user set. If the program wants 
to make sure a string be visible, it should explicitly output it, not by turn 
on the echo when user wants to turn it off. Only that way, both program can 
work properly and user's requirement can be met.
We use that feature to give user a menu to download files, but not let user see 
which files.

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https://bugs.launchpad.net/bugs/1225327

Title:
  sftp in 12.04 has tty attributes setting problem

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