On 2023-01-03, Michael Torrie <torr...@gmail.com> wrote: > On 1/3/23 11:45, Keith Thompson wrote: >> MRAB <pyt...@mrabarnett.plus.com> writes: >> [...] >>> The purpose of stderr is to display status messages, logging and error >>> messages, even user prompts, and not mess up the program's actual >>> output. This is important on a *nix system where you might be piping >>> the output of one program into the input of another. >> >> I would expect user prompts to be written to stdout, or perhaps to some >> system-specific stream like the current tty, not to stderr. If a >> program has user prompts, it probably doesn't make sense to pipe its >> output to the input of another. > > I can't think of a specific example, but I know I have piped the output > of a program while at the same time interacting with a prompt on stderr. > A rare thing, though.
Programs that ask for passwords often do it by reading/writing to fd 0 or /dev/tty so that stdout is unaffected. -- Grant -- https://mail.python.org/mailman/listinfo/python-list
