RFR: 8304498: JShell does not switch to raw mode when there is no /bin/test

[Alan Bateman]

On Mon, 20 Mar 2023 12:10:04 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> If JShell is run on a system that does not have `/bin/test` (which is, apparently, possible for some systems, which only have `/usr/bin/test`), it won't switch the terminal into the raw mode, and the input will not work properly.
> 
> The proposed fix herein is to detect whether `test` existing in `/usr/bin/test`, and if yes, use that location. Use the existing `/bin/test` otherwise.

As a general point, we probably need to change jline to not create sub-processes. If we needs to introspect the environment then it will need to do it in the current VM.

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PR: https://git.openjdk.org/jdk/pull/13100