How can I login with ssh in bash shell ?

How can I login with ssh in bash shell ?

[wolfgang127jp]

Hi gurus,

I wanna login to my server with ssh command in bash shell.
I found a script that login to a server with ftp command in bash shell.

The following is the snippet of a ftp shell..
---------------------------
ftp -n $Server <<End-Of-Session

user anonymous "$Password"
binary
bell                # Ring 'bell' after each file transfer
cd $Directory
put "$Filename.lsm"
put "$Filename.tar.gz"
bye
End-Of-Session

---------------------------------- 

so I made a simple script(simple.sh) below.
(abcdefg is the password of my_user)
----------------------------------
#!/bin/sh

ssh my_user@my_server <<END
abcdefg
echo "It works !!" > does_this_script_work.txt
exit
END

exit 0
---------------------------------

The result was....
-----------------------------
$ ./simple.sh
Pseudo-terminal will not be allocated because stdin is not a terminal.
my_user@my_server's password:
-----------------------------
Asking me the password ...

Why doesn't it work ?

I know It's not secure cuz the password is in the script, but I really
wanna make it work.

Please give me any hints.

Thanks in advance.

wolfgang.

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Re: How can I login with ssh in bash shell ?

[Robin Doer]

Am Dienstag, 24. Juni 2003 17:05 schrieb wolfgang127jp@ybb.ne.jp:
> Hi gurus,
>
> I wanna login to my server with ssh command in bash shell.
> I found a script that login to a server with ftp command in bash shell.
>
> [...]
> ----------------------------------
>
> so I made a simple script(simple.sh) below.
> (abcdefg is the password of my_user)
> ----------------------------------
> #!/bin/sh
>
> ssh my_user@my_server <<END
> abcdefg
> echo "It works !!" > does_this_script_work.txt
> exit
> END
>
> exit 0
> ---------------------------------
>
> The result was....
> -----------------------------
> $ ./simple.sh
> Pseudo-terminal will not be allocated because stdin is not a terminal.
> my_user@my_server's password:
> -----------------------------
> Asking me the password ...
>
> Why doesn't it work ?

That will not work because, however, ssh doesn't read the passwort from stdin 
(like ftp).

But there's a way to use ssh without a password-request:

On your local machine create a key with "ssh-keygen -t rsa" (use empty 
passphrase). After that copy the public part of the key (located in 
~/.ssh/id_rsa.pub) to your remote machine under ~/.ssh/authorized_keys).
Now your script should work.

Hope it helps,
Robin
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Re: How can I login with ssh in bash shell ?

[Stephen Samuel]

the public key should go into authorized_keys2

alsoe: I'd suggest using:
	ssh-keygen -f nopw.key -t rsa

you will end up with the private key in nopw.key
and the public key in nopw.key.pub

You can then do: ssh -i nopw.key remote_host

The main difference here is that you don't end up with your
passwordless key being your default (probably a bad idea).

BTW: you can setup ssh so that the recipient machine, when
it accepts the passwordless key can only execute one specific
command. (makes it harder for a hacker to cause you damage
if they get hold of the key).

Robin Doer wrote:

 >>----------------------------------
 >>
 >>so I made a simple script(simple.sh) below.
 >>(abcdefg is the password of my_user)
 >>----------------------------------
 >>#!/bin/sh
 >>
 >>ssh my_user@my_server <<END
 >>abcdefg
 >>echo "It works !!" > does_this_script_work.txt
 >>exit
 >>END
 >>
 >>exit 0
 >>---------------------------------
 >>
 >>The result was....
 >>-----------------------------
 >>$ ./simple.sh
 >>Pseudo-terminal will not be allocated because stdin is not a terminal.
 >>my_user@my_server's password:
 >>-----------------------------
 >>Asking me the password ...
 >>
 >>Why doesn't it work ?
 >
 >
 > That will not work because, however, ssh doesn't read the passwort from stdin
 > (like ftp).
 >
 > But there's a way to use ssh without a password-request:
 >
 > On your local machine create a key with "ssh-keygen -t rsa" (use empty
 > passphrase). After that copy the public part of the key (located in
 > ~/.ssh/id_rsa.pub) to your remote machine under ~/.ssh/authorized_keys).
 > Now your script should work.


-- 
Stephen Samuel +1(604)876-0426                samuel@bcgreen.com
		   http://www.bcgreen.com/~samuel/
    Powerful committed communication. Transformation touching
        the jewel within each person and bring it to life.

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