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Env(3)		       Perl Programmers Reference Guide			Env(3)

       Env - perl module that imports environment variables as scalars or

	   use Env;
	   use Env qw(PATH HOME TERM);
	   use Env qw($SHELL @LD_LIBRARY_PATH);

       Perl maintains environment variables in a special hash named %ENV.  For
       when this access method is inconvenient, the Perl module "Env" allows
       environment variables to be treated as scalar or array variables.

       The "Env::import()" function ties environment variables with suitable
       names to global Perl variables with the same names.  By default it ties
       all existing environment variables ("keys %ENV") to scalars.  If the
       "import" function receives arguments, it takes them to be a list of
       variables to tie; it's okay if they don't yet exist. The scalar type
       prefix '$' is inferred for any element of this list not prefixed by '$'
       or '@'. Arrays are implemented in terms of "split" and "join", using
       $Config::Config{path_sep} as the delimiter.

       After an environment variable is tied, merely use it like a normal
       variable.  You may access its value

	   @path = split(/:/, $PATH);
	   print join("\n", @LD_LIBRARY_PATH), "\n";

       or modify it

	   $PATH .= ":.";
	   push @LD_LIBRARY_PATH, $dir;

       however you'd like. Bear in mind, however, that each access to a tied
       array variable requires splitting the environment variable's string

       The code:

	   use Env qw(@PATH);
	   push @PATH, '.';

       is equivalent to:

	   use Env qw(PATH);
	   $PATH .= ":.";

       except that if $ENV{PATH} started out empty, the second approach leaves
       it with the (odd) value "":."", but the first approach leaves it with

       To remove a tied environment variable from the environment, assign it
       the undefined value

	   undef $PATH;
	   undef @LD_LIBRARY_PATH;

       On VMS systems, arrays tied to environment variables are read-only.
       Attempting to change anything will cause a warning.

       Chip Salzenberg <chip@fin.uucp> and Gregor N. Purdy

perl v5.10.1			  2009-02-12				Env(3)

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