[SOLVED] ed text editor not saving/printing # character

amikoyan · 02-15-2023, 10:06 AM

I am using v7 Unix in a simh pdp11 emulator.
The only text editor available is ed, I think.
I am trying to write

Code:

#include <stdio.h>

in ed. It enters ok, but the # will not appear in the saved file. Also entering #'s appears to delete a similar number of characters before the #'s, if you see what I mean:
I entered this in ed and wq'd to write and quit:

Code:

Hello##### is this here?
I have ### added some hash tags

This is what is saved:

Code:

 cat test.txt
 is this here?
I ha added some hash tags.

I don't seem to need #include <stdio.h> as I it seems I can compile without it in v7, but it would be nice to know why #'s seem to cause problems.

pan64 · 02-15-2023, 10:22 AM

# seems to mapped to backspace, so you need to remap it. stty can be used to do that.

amikoyan · 02-15-2023, 12:34 PM

Quote:

Originally Posted by pan64

# seems to mapped to backspace, so you need to remap it. stty can be used to do that.

I have remapped it to ctrl H

Code:

stty erase ^H

Code:

 $ stty
speed 300 baud
erase = '^H'; kill = '@'
even odd -nl echo -tabs

Which a little bit of googling leads me to believe is traditional?

Thank you pan64.

amikoyan · 02-15-2023, 02:53 PM

This is from

Code:

              Setting Up Unix - Seventh Edition


                      Charles B. Haley
                     Dennis M. Ritchie

                     Bell Laboratories
               Murray Hill, New Jersey 07974

A few paragraphs down the document it says:

Code:

 If you should make a mistake while typing, the  charac-
ter  '#' erases the last character typed up to the beginning
of the line, and the character '@' erases  the  entire  line
typed.   Some  consoles  cannot  print  lower  case letters,
adjust the instructions accordingly.

https://gunkies.org/wiki/Setting_Up_...eventh_Edition

pan64 · 02-16-2023, 12:47 AM

Quote:

Originally Posted by amikoyan

Which a little bit of googling leads me to believe is traditional?

Thank you pan64.

You are welcome.

I don't actually remember where it came from, but I remembered something....
You know, it was over 30 years ago.