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8.64. Env
Lets your program
treat environment variables as simple variables instead of having to
access them from the %ENV pseudo-hash where they
are kept. (Note that pseudo-hashes will disappear as of Perl 6.)
use Env;
use Env qw(var1 var2 ...);
Internally, Env uses an import function that ties
suitably named environment variables to global Perl variables with
the same names. By default, it ties all variables yielded by
keys %ENV. A
"suitable" environment has a name
that begins with an alphabetic character and contains only
alphanumeric characters or underscores.
When use Env is invoked with arguments, the
arguments are interpreted as a list of environment variables to
tie, but the variables don't have
to exist yet. After a variable has been tied, you can use it like a
normal variable, accessing or changing its value.
You untie a variable by setting its value to undef.
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| 8.63. English |  | 8.65. Errno |
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