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in reply to Help in running ssh command on a remote machine

what he said. It's as simple as 

ssh-keygen -t dsa

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then copy the key to the appropriate file on remote server

man ssh-keygen is your friend. the above command generates: 


$HOME/.ssh/id_dsa.pub
Contains the protocol version 2 DSA public key for authentication.  Th
+e contents of this file should be added to $HOME/.ssh/authorized_keys
+ on all machines where the user wishes to log in using public key aut
+hentication.  There is no need to keep the contents of this file secr
+et.

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though the man page says authorized_keys my experience says authorized_keys2. Use protocol 2, as you will be when you use dsa. preferable

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