Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

As far as I know the default ssh option StrictHostKeyChecking is set to ask so the first ssh connection seems like:

$ ssh
The authenticity of host ' (' can't be established.
RSA key fingerprint is 52:9b:0a:f1:e4:51:1b:96:8c:b7:96:7c:d3:d2:7d:9f.
Are you sure you want to continue connecting (yes/no)?
  • I'd like to automatically add host key for the first time assuming the possible security issue.
  • I'd like the host key to be used by any local user automatically (e.g. without any extra ssh command-line options).
share|improve this question

migrated from Mar 12 '13 at 9:50

This question came from our site for professional and enthusiast programmers.

I've read man ssh and man ssh_config and figured out the solution for this:


for host in \ \ \
; do
    ssh-keygen -R $host -f $SSH_KNOWN_HOSTS
    ssh -q -o StrictHostKeyChecking=no -o BatchMode=yes -o UserKnownHostsFile=$SSH_KNOWN_HOSTS $host echo '' || true
chmod a+r $SSH_KNOWN_HOSTS

It works but seems hacky. Do you know a shorter way to do this ?

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .