Cwd(3)                 Perl Programmers Reference Guide                 Cwd(3)

       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 the section on
       Overriding Builtin Functions in the perlsub manpage.) Note that it will
       only be kept up to date if all packages which use chdir import it from

3rd Berkeley Distribution    perl 5.005, patch 02                       Cwd(3)