After installing Bash on Ubuntu on Windows, I'm receiving an error from any rlwrap command.
root@localhost:~# rlwrap ls
rlwrap: Could not open master pty: No such file or directory
I've made sure that /dev/ptmx has the correct permissions
root@localhost:~# ls -ld /dev/ptmx
crw-rw-rw- 1 root tty 5, 2 Apr 9 22:44 /dev/ptmx
Yet I still can't get it working. Am I the only one encountering this error? Any help would be greatly appreciated.
Windows Subsystem for Linux (WSL) doesn't (yet?) have a working pty implementation. I suspect that opening /dev/ptmx always fails for this reason, even though the device file exists and has the right permissions.
rlwrap, but also programs like screen and tmux, are never going to work without a pty device. They fail under WSL for the same reason as rlwrap.
Hans (rlwrap maintainer)