--- Madhu Reddy <[EMAIL PROTECTED]> wrote:
> Hi,
> I want to put MFILE=mdl_data.txt in ENV and want to
> access later..
> i am trying following...I am getting error...
> system(`MFILE=mdl_data.txt`);
> $k6 = "MFILE";
> $key6 = $ENV{$k6};
> print "$key6 \n";
> how to do this ?
The system() call spawns a subprocess with it's own environment, in
which you set the variable. Then the process ends and it's environment
is recycles, along with your variable, before the next statement.
Just set it directly:
$ENV{MFILE}='mdl_data.txt';
Also, there's an error there: your system call argument is in
backticks. That shells out a subprocess to do the assignment, which
gets cleaned up as before, but creates no output. The output (none) is
returned _from_the_backticks_to_the_system()_call_as an argument to be
fed to *another* subprocess.....
In other words backticks and system() are each basically doing the same
thing, except that backticks return the output to their context and
system() doesn't, so DON'T use both unless you want one's output as the
arg for the other!
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