1. Non-interactive Authentication for SFTP from Shell?
I don't know much about OpenSSH. Please kindly help on the following
Does anybody know whether sftp (OpenSSH 2.9) can do non-interactive
authentication or not? I need to run some automatic sftp to transfer
files between two servers. If current version sftp didn't allow
non-interactive authentication, I could not do it automatically.
For "ftp", it is like:
ftp -n host
user username passwd
But there are is not a clear non-interactive usage descriptions in the
OpenSSH manuals, and sftp doesn't seem to have similar "-n" option as
Furthermore, if I can't use sftp to do automatic file transfer, can I
use scp to do it? At this time, I just doubt it.
From what I understood the manuals, I have tried this:
sftp -b batch_file host
The question is sftp can only execute what is written in the
batch_file AFTER it successfully authenticates the password -- that
is, before sftp ever tries to read your batch_file, it will always
prompt you to enter your password.
Actually, I have also tried this:
sftp -oBatchMode=yes host
But I don't know which file (and to which line and in what format) to
put my password in -- OpenSSH has quite a few config files.
Of course when you use "ftp -v host" you will read the verbose
messages that sftp will ask for several different types of
authentications. The password authentication seems to be the one that
is NOT well done at this time -- Or maybe I don't have much knowledge
A review of sftp manual says:
sftp is an interactive file transfer program, similar to ftp(1), which
performs all operations over an encrypted ssh(1) transport. It may
also use many features of ssh, such as public key authentication and
compres-sion. sftp connects and logs into the specified host, then
enters an interactive command mode.
The second usage format will retrieve files automatically if a
non-interactive authentication method is used; otherwise it will do so
after successful interactive authentication.
The last usage format allows the sftp client to start in a remote
However for this second usage from the listed options, you may find
that you almost can not do your password authentication
Maybe it depends on how to configure the ssh_config and some other
config files? -- There is NOT a clear clue for which file and which
line in the file that sftp may look for the password.
I doubt if anybody had the same trouble? Any hints?
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