Re: Examples of concurrent coproc usage?

[Zachary Santer]

On Sat, Apr 13, 2024 at 4:10 PM Chet Ramey <chet.ramey@case.edu> wrote:
>
> The original intent was to allow the shell to drive a long-running process
> that ran more-or-less in parallel with it. Look at examples/scripts/bcalc
> for an example of that kind of use.

$ ./bcalc
equation: -12
./bcalc: line 94: history: -1: invalid option
history: usage: history [-c] [-d offset] [n] or history -anrw
[filename] or history -ps arg [arg...]
-12
equation: exit

diff --git a/examples/scripts/bcalc b/examples/scripts/bcalc
index bc7e2b40..826eca4f 100644
--- a/examples/scripts/bcalc
+++ b/examples/scripts/bcalc
@@ -91,7 +91,7 @@ do
        esac

        # save to the history list
-       history -s "$EQN"
+       history -s -- "$EQN"

        # run it through bc
        calc "$EQN"