Shell Programming and Scripting

Dear all,

I want to SSH a machine say and i want to execute a command but when i ssh its asks for the password. i want to make it in a script such that i donot have to enter password manually every time,

Command looks like this:

ssh machine1 df -k

Thanks,

BR/Asads

If you have TCL/expect installed :

Code:

set timeout -1

spawn ssh -oPort=22 -oStrictHostKeyChecking=no -oCheckHostIP=no -oHostKeyAlias=some_name user@host $your-command
expect ?assword:

send "$pass\r"
expect $what-you-expect-to-see>

send "exit\r"
expect eof

Modify these per your needs, also, I believe that this topis has been discussed, if this doesn't work for you, try the search for relative keywords.

actually this can be done by setting up ssh key on each server.
1. you need an ssh key on each server
* Look in $HOME/.ssh for a file pair named is_rsa and id_rsa.pub. If they exist skip to the step 2
* If they don't exist, they will need to be generated:
A) Run 'ssh-keygen -t rsa'
B) Accept the default filename for storing the key ("id_rsa" is default)
C) If this key will be used for automated file transfers, hit enter each time when prompted for a passphrase.

2. Verify that permission are no greater than 755 on the id_rsa* files, the .ssh directory, and all directories back to root.
* Any directory that has write permissions by Group or Others will "break" the ssh functionality and the keys will not be used during authentication.

3. Next, put the contents of the id_rsa.pub file from one box into the $HOME/.ssh/authorized_keys file on the other box, and vise versa

4. Your "secure link" should be working. Test it by doing something similar to the following:
* ssh USER@HOST date'
* This should return the remote server's date without prompting for a password.

5. Now that ssh is set up, you may use "scp" to secure copy files between hosts.
* SCP syntax: scp localpath/localfile user@remotehost:remotepath/remotefile

How to we find that if TCL/expect is installed or not?