msys not flushing output

青春壹個敷衍的年華 提交于 2019-11-29 16:27:13

This can be an issue when msys uses the rxvt shell under a number of scenarios. In cases where I see this problem, I ask msys to use the native Windows shell for its console. For example:

C:\MinGW\msys\1.0\msys.bat --no-rxvt

I thought that modern MSYS installations default to using the native shell as MSYS developers seem to prefer it. I have other issues with the native shell that drive me to use the rxvt shell, so I do infrequently run into this issue.

C:\MinGW\msys\1.0\msys.bat --rxvt

I find that the rxvt shell usually works fine except for certain applications that are built as "console" utilities meant to run from a command-line.

The only thing that worked for me was to precede the command with winpty ...

$ winpty java ClassName

It causes unbuffered output to be 3x slower and buffered output to be 5x slower (in my case, with Java).


To always have a command invisibly invoked by winpty ...

$ cd ~
$ pwd -W

... add the following line to .bashrc ...

alias java="winpty java"

... then restart terminal and ignore the (one-time) warning message.

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