Bash script that connects to server using ssh [clo

Question

I am trying to write a bash script that will allow me to login using ssh connection. The condition is that the password is stored into a .txt file.

I need to write a bash script that will automatically request a connection to

   ssh [e-mail] -p 733

and automatically will use the passwords that are stored into a .txt file

I never wrote something in bash. Can someone help me. Thank you in advance for your time.

Answer 1

i suggest you to use password less authentication it will be more secure follow these steps :

example@example:~/bash$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/example/.ssh/id_rsa): ## the directory which located private key and public key.
Enter passphrase (empty for no passphrase): ## you can use passphrase password if you want .
Enter same passphrase again: ## enter same password again.
Your identification has been saved in /home/example/.ssh/id_rsa.
Your public key has been saved in /home/example/.ssh/id_rsa.pub.
The key fingerprint is:
70:03:68:70:0a:52:16:55:55:66:62:2b:51:67:81:92 example@example
The key's randomart image is:
+--[ RSA 2048]----+
|o.=+oo++=oB.     |
|.o oo E+.B       |
|  ..  o.+        |
|       + .       |
|        S        |
|                 |
|                 |
|                 |
|                 |
+-----------------+

then type

scp -o Port=733 ~/.ssh/id_rsa.pub [e-mail]:/home/example/.ssh/authorized_keys

• then it will ask you first time for your remotely server for latest time
• now if you type ssh -p 733 [e-mail] you don't need to put any password again that's it password less authentication more secure than any script.

Answer 2

You can't do it with plain bash script. You need to use expect command.

Having said that it is really a very bad idea to have a password stored in a text file, here is how you can do it using expect:

#!/usr/bin/expect

set timeout 20
set f [open "password.txt"]
set password [read $f]
close $f

spawn ssh user@host
expect "user@host's password:"
send $password
interact

Still I suggest to follow @Wolph's advice to look into using a pair of keys when accessing a remote server using ssh.