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    <p>There is no clean solution for the problem you noted as far as I am aware.<br> The previously suggested /dev/null redirection will still display the warning, it just disables the security feature of storing the remote keys by redirecting the output into /dev/null.<br> So ssh would still think it writes something which is actually discarded. </p> <p>As I know the only option is to catch the message and remove it from stdout. </p> <pre><code>ssh/scp..... 2&gt;&amp;1 | grep -v "^Warning: Permanently added" </code></pre> <p>Here is a complete example that you can use as wrapper to hide such warnings: </p> <pre><code>#!/bin/bash remove="^Warning: Permanently added" # message to remove from output cmd=${0##*/} case $cmd in ssh) binary=/usr/bin/ssh ;; *) echo "unsupported binary ($0)" exit ;; esac $binary "$@" 2&gt;&amp;1 | grep -v "$remove" </code></pre> <p>To install it all you need to do is add/modify the "case" statement for the actual command you wish to modify. (ssh, scp, git etc).<br> the "ssh)" means the script has to be named "ssh" (or a link to the script is named ssh). The binary=/full/path is the path to the binary the script should wrap.<br> Then put the script with a name of your choice into /bin or somewhere else. </p> <p>The script also the place where you can use a <em>-o "UserKnownHostsFile=/dev/null"</em> to the $binary variable, that's a lot better than putting such a security risk into the global ssh configuration which will affect all your ssh sessions and not just those you want to supress the message. </p> <p>Disadvantages:<br> It's a bit overhead, not a perfectly clean solution and moves stderr into stdout which might not be good in all cases.<br> But it will get rid of any sort of warning messages you don't wish to see and you can use a single script to wrap all binaries you want (by using filesystem links to it)</p>
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    1. POGit says "Warning: Permanently added to the list of known hosts"
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    1. USJohn
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    1. CObad idea, error stream now contaminates stdout.
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      1. USElazar Leibovich
    2. CORedirection is the only working method without hacking ssh
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