How are environment variables handled in Perl?

In Perl, you can access and modify environment variables using the %ENV hash. Here are some example codes:

1. Get the value of an environment variable:

my $path = $ENV{'PATH'};
print "PATH: $path\n";

1. Setting the value of environment variables:

$ENV{'MY_VARIABLE'} = 'value';

1. Check if the environment variable exists:

if (exists $ENV{'MY_VARIABLE'}) {
    print "MY_VARIABLE exists\n";
} else {
    print "MY_VARIABLE does not exist\n";
}

1. Remove environment variables.

delete $ENV{'MY_VARIABLE'};

It is important to note that changing environment variables will affect the entire Perl script.