How to respond to password prompt when using SCP i

问题:

First of all, I am well aware of that there are many of questions regarding this topic. I have read them, but still could figure out an appropriate answer for my situation.

I would like to scp the entire ~/cs###/assign1 dir from local to school home dir with a shell script. My question is, is there a way in my script to wait for the password prompt, and then simulate key board event to 'type' in my password?

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here is a really detailed guide of how to set up the key

回答1:

Are ssh keys not allowed? That would be a better solution.

回答2:

Use "sshpass"!

#!/bin/bash
sshpass -p "password" scp -r /some/local/path [e-mail]:/some/remote/path

回答3:

I don't think you can easily do that. What you can do is using public key authentication instead.

Something along these lines

ssh-keygen -t rsa
ssh school mkdir .ssh/
cat ~/.ssh/id_rsa.pub | ssh school "cat >>.ssh/authorized_keys"

(or dsa).

But hey, it's not serverfault, is it? ;-)

回答4:

Consider using keys, or an external library.

I don't think it's possible otherwise (I hope I'm not wrong), as it imposes automatic brute force intrusion and sniffing of passwords.

There are libraries that can do what you want (use the SFTP protocol, not calling scp), such as libssh.

Again, I highly recommend keys.

回答5:

Something like this - http://code.google.com/p/enchanter/ ?

回答6:

I agree that you should use keys. But expect can automate the interactive aspect of the process IF you want to hardcode your password in a plain-text script file.

回答7:

If you can mount the directory from a Windows machine (e.g. via AFS, NFS or SMB which my university's Windows labs all did), you can use pscp with the -pw switch.

回答8:

Why not just use the "-r" option to copy it recursively? Or use rsync instead?

You could also use public key authentication, which requires no help on their end as long as you have an actual user account. See this

回答9:

You don't say which platform you are using at home and at school. Assuming Linux, Cygwin or OS/X you have several options:

1. Public key authentication if it hasn't been turned off at the server
2. ssh-agent and ssh-add to enter your password once per session

For option (1), you would

1. generate a keypair at home using ssh-keygen, with no passphrase on the private key. Note that omitting a passphrase is probably not a good idea if other people use the same computer, but your objective was to get around having to type in the password.
2. upload the PUBLIC key to your school account and place it in ~/.ssh/authorized_keys
3. Use scp with the "-i identityfile" option, where identityfile is the full path to your private key. Or, add an entry to .ssh/config (see the man pages)

For the second option, ssh-agent allows you to cache your password in a local process one time per session. You set an expiration time

回答10:

As many have already said that using ssh keys would be the safest and best way. If anyone else is still wondering around and searching for help, in Ubuntu help there is a fast and straight forward way to use ssh keys.

回答11:

Once you set up ssh-keygen as explained here, you can do

scp -i ~/.ssh/id_rsa /local/path/to/file [e-mail]:/path/in/remote/server/

where id_rsa is the local key generated in the ssh-keygen setup.

If you want to lessen typing each time, you can modify your .bash_profile file and put

alias remote_scp='scp -i ~/.ssh/id_rsa /local/path/to/file [e-mail]:/path/in/remote/server/

Then from your terminal do source ~/.bash_profile. Afterwards if you type remote_scp in your terminal it should run the scp command without password.

回答12:

I found no way to do this on our systems automatically - I ssh into one device, and then ssh to the next device, and on both, I cannot install any other software. So I can only use existing shell script commands. I can either copy all the files of a type with, such as *.png, or one by one in my script file, having to enter the password for each individual file. The one thing I did that was helpful was to type the password into a file, cut it, and be able to paste it to each prompt for each file.