On 07/18/2016 08:30 PM, Kurtis Rader wrote:
On Mon, Jul 18, 2016 at 4:37 PM, Patrick
<patr...@spellingbeewinnars.org
<mailto: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
Hi Kurtis and all
It took a while for my post to end up broadcast to the list. I figured
things out in the meantime.
I opened up fish
I created a variable and exported it
I launched my COBOL program from within fish
I was able to read the environment variable fine
Sorry for the noise everyone!
-Patrick
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