getcwd - get pathname of current working directory
use Cwd; $dir = cwd;
use Cwd; $dir = getcwd;
use Cwd; $dir = fastgetcwd;
use Cwd 'chdir'; chdir "/tmp"; print $ENV{'PWD'};
use Cwd 'abs_path'; print abs_path($ENV{'PWD'});
use Cwd 'fast_abs_path'; print fast_abs_path($ENV{'PWD'});
The getcwd()
function re-implements the getcwd(3)
(or getwd(3))
functions in Perl.
The abs_path()
function takes a single argument and returns
the absolute pathname for that argument. It uses the same algoritm as
getcwd().
(actually getcwd()
is
abs_path(``.''))
The fastcwd()
function looks the same as
getcwd(),
but runs faster. It's also more dangerous because it
might conceivably chdir()
you out of a directory that it can't
chdir()
you back into. If fastcwd encounters a problem it will
return undef but will probably leave you in a different directory. For a
measure of extra security, if everything appears to have worked, the
fastcwd()
function will check that it leaves you in the same
directory that it started in. If it has changed it will die with the message ``Unstable directory path, current directory changed
unexpectedly''. That should never happen.
The fast_abs_path()
function looks the same as
abs_path(),
but runs faster. And like fastcwd()
is more dangerous.
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.