Am 16.01.2024 um 22:38 schrieb Jim Garrison via Cygwin:
TL;DR
New laptop, setting up mintty configuration identical to working
desktop system. When connected to one specific Debian 11 (Bullseye)
system (to which I connect often from the desktop with no issues),
backspace appears to send ^H, and Debian interprets ^H correctly, but
the terminal display echoes a space character instead of backing up
one space.
Details
I have mintty set to term type "mintty" and "Keys/Backarrow sends ^H".
A little experimentation shows that the Debian system is correctly
interpreting the backspace, only the mintty display is incorrect. I
guess there are two possibilities:
* Debian is echoing a blank when receiving ^H
* mintty is not correctly displaying the ^H echoed by Debian
Note, a local mintty session is NOT affected, backspace works fine there.
Also note when I ssh to a Debian 12 system and an old CentOS 7 system
I don't see this issue, and when connecting from my desktop all three
systems work. I am stumped for how to troubleshoot this further.
I diffed the output of "stty -a" between the non-working system and
one that works. The only differences are:
Working system: eol = <undef>; eol2 = <undef>;
Non-working system: eol = M-^?; eol2 = M-^?;
cygcheck.out attached
On the Debian 11 (non-working) system:
jhg@smtp ~
$ echo $TERM
mintty
jhg@smtp ~
$ stty -a
speed 38400 baud; rows 37; columns 128; line = 0;
intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = M-^?;
eol2 = M-^?; swtch = <undef>; start = ^Q; stop = ^S;
susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O; min = 1;
time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl
ixon -ixoff -iuclc ixany imaxbel iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0
bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop
-echoprt echoctl echoke -flusho -extproc
You've verified the stty setting 'erase' above, please also verify the
mintty behaviour, e.g. with ^V Backarrow in a command line (to echo the
character as ^H, hopefully) to check that the two settings match
consistently.
I've noticed myself on an older Debian system that behaviour of the
'erase' character may be weird; it initially worked as expected with ^H,
then I switched to stty erase ^?, then back to ^H, and behaviour was
different: ^H did not erase a character anymore but echoed "^H". Anyway,
this is handling of the shell (or realine library) and not under control
of mintty.
Thomas
--
Problem reports: https://cygwin.com/problems.html
FAQ: https://cygwin.com/faq/
Documentation: https://cygwin.com/docs.html
Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
