<div dir="ltr">my copy of plan 9 gave the actual name of the paper ("An Algorithm for Differential File Comparison"), at which point the PDF is Google's first match: <a href="https://www.cs.dartmouth.edu/~doug/diff.pdf">https://www.cs.dartmouth.edu/~doug/diff.pdf</a><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 30, 2022 at 1:24 AM Rob Landley <<a href="mailto:rob@landley.net">rob@landley.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Instead of linking to posix, the diff.c in toybox pending links to<br>
<a href="http://cm.bell-labs.com/cm/cs/cstr/41.pdf" rel="noreferrer" target="_blank">http://cm.bell-labs.com/cm/cs/cstr/41.pdf</a> at the top, but Lucent-alcatel<br>
apparently took that server down in 2015 and it had a robots.txt that prevented<br>
<a href="http://archive.org" rel="noreferrer" target="_blank">archive.org</a> from preserving its contents. (There's an incomplete mirror of the<br>
"who" directory, but not the "cstr" directory, at<br>
<a href="http://cm-bell-labs.github.io/who/" rel="noreferrer" target="_blank">http://cm-bell-labs.github.io/who/</a> .)<br>
<br>
It looks like posix has a reasonable diff description including unified format,<br>
but I'd like to read the old thing to see why the linked to that instead, if<br>
anybody has a copy. (Really that whole directory seems like it had a bunch of<br>
cool computer history stuff in it...)<br>
<br>
Rob<br>
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</blockquote></div>