On Fri, Mar 08, 2002 at 06:23:15PM -0600, Xanh wrote:
> Hello,
> How do I export a change to an environment variable made in a C program?
> I tried setenv() and putenv(), but the change is not visible to the shell.
>
> ////////// testenv.c
> int main(int argc, char* argv[], char* envp[])
> {
> char* p;
> p = getenv("MyTest");
> printf("current value: %s\n", p);
>
> setenv("MyTest", "New value here", 1);
> p = getenv("MyTest");
> print("new value: %s\n", p);
>
> return 0;
> }
> /////////
This changes the environment variable just fine. If you subsequently (in
the same program) did something like this (untested):
system ("echo $MyTest");
you'd see it is set just fine.
The reason you don't see it being set when you run your program from
a shell is because environment variables are an attribute of the shell/
program and are visible only to THAT program or its children. You cannot
set the environment of any level of parent program.
> I compiled the code and test in a bash shell:
>
> $>export MyTest="Current Value"
> $>./testenv
> current value: Current Value
> new value: New value here
> $>echo $MyTest
> Current Value
>
> The old value is retained.
> Thanks for your help.
>
> Regards,
> Nemo Mai
>
>
>
>
>
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