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.TH Env 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
Env \- perl module that imports environment variables as scalars or arrays
\& use Env qw(PATH HOME TERM);
\& use Env qw($SHELL @LD_LIBRARY_PATH);
Perl maintains environment variables in a special hash named \f(CW%ENV\fR. For
when this access method is inconvenient, the Perl module \f(CW\*(C`Env\*(C'\fR allows
environment variables to be treated as scalar or array variables.
The \f(CW\*(C`Env::import()\*(C'\fR function ties environment variables with suitable
names to global Perl variables with the same names. By default it
ties all existing environment variables (\f(CW\*(C`keys %ENV\*(C'\fR) to scalars. If
the \f(CW\*(C`import\*(C'\fR function receives arguments, it takes them to be a list of
variables to tie; it's okay if they don't yet exist. The scalar type
prefix '$' is inferred for any element of this list not prefixed by '$'
or '@'. Arrays are implemented in terms of \f(CW\*(C`split\*(C'\fR and \f(CW\*(C`join\*(C'\fR, using
\&\f(CW$Config::Config{path_sep}\fR as the delimiter.
After an environment variable is tied, merely use it like a normal variable.
\& @path = split(/:/, $PATH);
\& print join("\en", @LD_LIBRARY_PATH), "\en";
\& push @LD_LIBRARY_PATH, $dir;
however you'd like. Bear in mind, however, that each access to a tied array
variable requires splitting the environment variable's string anew.
except that if \f(CW$ENV{PATH}\fR started out empty, the second approach leaves
it with the (odd) value "\f(CW\*(C`:.\*(C'\fR\*(L", but the first approach leaves it with \*(R"\f(CW\*(C`.\*(C'\fR".
To remove a tied environment variable from
the environment, assign it the undefined value
\& undef @LD_LIBRARY_PATH;
On \s-1VMS\s0 systems, arrays tied to environment variables are read\-only. Attempting
to change anything will cause a warning.
Chip Salzenberg <\fIchip@fin.uucp\fR>
Gregor N. Purdy <\fIgregor@focusresearch.com\fR>
projects / OpenSPARC-T2-SAM / blob