On Mon, Jul 18, 2016 at 4:37 PM, Patrick <patr...@spellingbeewinnars.org>
wrote:
> What I would like to do, is to write a fish script that ran a bunch of
> commands returning the values in environment variables. I would then
> like to access those variables from C( actually COBOL).
>
> I know this can be done with bash but is there a way to do it with fish ?
>
> The standard libraries will assume bash not fish.
>
It is not clear what you're trying to do. In the UNIX process model
environment variables are passed from the parent process to its child
processes. A child process cannot directly modify the environment vars of
its parent process. The only way to do so is via a cooperative strategy.
For example, the child process could write each env var to stdout in the
form "name=value\n" (you'll need to figure out how to encode newlines in
the value to make this bullet proof). The parent process would then create
a pipe and attach the stdout of the child process to one end of the pipe.
The parent process then reads the "name=value" lines from the other end of
the pipe and does whatever it wants with those env vars -- including
self-modifying its own set of env vars. In C you would do that with the
`putenv()` or `setenv()` functions.
Note that your problem statement, as written, is not unique to the fish
shell. The answer would be the same if you used bash or zsh.
--
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank
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