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

       Cwd - get pathname of current working directory

	   use Cwd;
	   my $dir = getcwd;

	   use Cwd 'abs_path';
	   my $abs_path = abs_path($file);

       This module provides functions for determining the pathname of the current working direc-
       tory.  It is recommended that getcwd (or another *cwd() function) be used in all code to
       ensure portability.

       By default, it exports the functions cwd(), getcwd(), fastcwd(), and fastgetcwd() into the
       caller's namespace.

       getcwd and friends

       Each of these functions are called without arguments and return the absolute path of the
       current working directory.

	       my $cwd = getcwd();

	   Returns the current working directory.

	   Re-implements the getcwd(3) (or getwd(3)) functions in Perl.


	       my $cwd = cwd();

	   The cwd() is the most natural form for the current architecture. For most systems it
	   is identical to `pwd` (but without the trailing line terminator).


	       my $cwd = fastcwd();

	   A more dangerous version of getcwd(), but potentially faster.

	   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 "Unsta-
	   ble directory path, current directory changed unexpectedly". That should never happen.

	     my $cwd = fastgetcwd();

	   The fastgetcwd() function is provided as a synonym for cwd().

       abs_path and friends

       These functions are exported only on request.  They each take a single argument and return
       the absolute pathname for it.

	     my $abs_path = abs_path($file);

	   Uses the same algorithm as getcwd().  Symbolic links and relative-path components ("."
	   and "..") are resolved to return the canonical pathname, just like realpath(3).


	     my $abs_path = realpath($file);

	   A synonym for abs_path().


	     my $abs_path = fast_abs_path($file);

	   A more dangerous, but potentially faster version of abs_path.

	   This function is Not taint-safe : you can't use it in programs that work under taint


       If you ask to override your chdir() built-in function,

	 use Cwd qw(chdir);

       then your PWD environment variable will be kept up to date.  Note that it will only be
       kept up to date if all packages which use chdir import it from Cwd.

       o   Since the path seperators are different on some operating systems ('/' on Unix, ':' on
	   MacPerl, etc...) we recommend you use the File::Spec modules wherever portability is a

       o   Actually, on Mac OS, the "getcwd()", "fastgetcwd()" and "fastcwd()" functions  are all
	   aliases for the "cwd()" function, which, on Mac OS, calls `pwd`. Likewise, the
	   "abs_path()" function is an alias for "fast_abs_path()".


perl v5.8.0				    2002-06-01					 Cwd(3pm)
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