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Added Chromebook ssh instructions - online edit of handbook/computing/basiclaptop.html

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handbook/computing/basiclaptop.html
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@ -122,6 +122,16 @@ careful when naming files and survex names</a> and be <a href="manual.html#quick
Only machines which have done the key-pair setup process can do scp, sftp or rsync.
</p>
<h3>Chromebooks</h3>
<p>You do not need to install any special software to use a Chromebook (even a very old one) to interact with the website.
<p>You do not need to install any software to get <var>scp</var> or <var>ssh</var> running either: these are pre-installed on every Chromebook as part of ChromeOs, but getting to them is not so easy:
<ul>
<li>Boot into <a href="https://www.businessinsider.com/guides/tech/chrome-os-developer-mode?r=US&IR=T">Developer Mode</a> (which deletes all user data, so do this when you buy the thing, not later).
<li>Visit the special <a href="https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_mode.md">[crosh] </a> web page in the Chrome browser by pressing Ctrl-Alt-T
<li>type <var>shell</var> which then puts you into a bash session
<li> Now you can access ssh, ssh-keygen, sftp and scp (but not rsync) from the command line.
<li>NB The default user is 'chronos' and they keys will be generated in <var>/home/chronos/user/.ssh/</var> so generate them using the command <var>ssh-keygen -C myrealname@mychromebook</var> and get the public key copied ot the expo server as it instructs in <a href="https://expo.survex.com/handbook/computing/keyexchange.html">Key Pair setup</a>.
</ul>
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