use Cwd;
$dir = cwd;
use Cwd;
$dir = getcwd;
use Cwd;
$dir = fastgetcwd;
use Cwd 'chdir';
chdir "/tmp";
print $ENV{'PWD'};
getcwd function re-implements the getcwd (or
getwd) functions in Perl.
The fastcwd function looks the same as getcwd,
but runs faster. It's also more dangerous because you might conceivably
chdir out of a directory that you can't chdir
back into.
The cwd function looks the same as getcwd and fastgetcwd but
is implemented using the most natural and safe form for the current
architecture. For most systems it is identical to `pwd` (but without the
trailing line terminator). It is recommended that cwd (or another *cwd()
function) is used in all code to ensure portability.
If you ask to override your chdir built-in function, then your
PWD environment variable will be kept up to date. (See
Overriding Builtin Functions.) Note that it will only be kept up to date if all packages which use
chdir import it from Cwd.