30 Mar
2021
30 Mar
'21
2:55 a.m.
My high school had some computer, don't remember what, may have been a
PDP 11. The *only* terminal was a line printer, probably a DECwriter,
don't remember. I do remember it being about 130 columns.
I don't remember if it was the real ed or a clone, but the editor was
very similar to ed(1). And yes, it's the only way to go with a printer
console.
On Mon, Mar 29, 2021 at 01:50:55PM -0700, Michael Usher wrote:
I think you can only truly appreciate ed when you were
forced to use a DECwriter as your terminal because all the VT100s were in use. (Undergrad
student lab)
???
Michael Usher
Network Operations Manager
University of California, Santa Cruz
musher(a)ucsc.edu 831-459-3697
--
---
Larry McVoy lm at mcvoy.com http://www.mcvoy.com/lm
On Mar 29, 2021, at 12:50 PM, Rob Pike
<robpike(a)gmail.com> wrote:
Ed is the standard editor.
-rob
On Tue, Mar 30, 2021 at 1:36 AM Larry McVoy <lm(a)mcvoy.com
<mailto:lm@mcvoy.com>> wrote:
I had *.clients.your-server.de <http://clients.your-server.de/> crawling mcvoy.com
<http://mcvoy.com/> in violation of my
robots.txt. For whatever reason, the tty settings (or something)
made vi not work, I dunno what the deal is, stty -tabs didn't help.
So I had to resort to ed to write and debug the little program below.
It was surprisingly pleasant, it's probably the first time I've used ed
for anything real in at least a decade. My fingers still know it.
+1 for ed. It's how many decades old and still useful?
#!/usr/libexec/bitkeeper/bk tclsh
int
main(void)
{
FILE log = popen("/var/log/apache2/dns.l", "r");
string buf, ip;
string dropped{string};
fconfigure(log, buffering: "line");
while (buf = <log>) {
unless (buf =~ /([^ ]+\.your-server\.de\.) /) continue;
ip = $1;
if (defined(dropped{ip})) continue;
dropped{ip} = "yes";
warn("DROP ${ip}\n");
system("/sbin/iptables -I INPUT -s ${ip} -j DROP");
}
}