<div dir="auto"><div>Looking at sources on TUHS, it looks like ed had it as early as V5:</div><div dir="auto"><a href="https://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s1/ed1.s" rel="noreferrer noreferrer" target="_blank">https://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s1/ed1.s</a></div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Mon, Jul 31, 2023, 10:48 PM ron minnich <<a href="mailto:rminnich@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer noreferrer noreferrer" target="_blank">rminnich@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I got to wondering, based on the sendmail discussions, how many shell<br>
escapes have appeared over the years?<br>
<br>
uucp<br>
sendmail<br>
xdvi : "The "allowShell" option enables the shell escape in PostScript specials"<br>
<br>
There must be a lot of them, however.<br>
</blockquote></div></div></div>