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RedHat 9 (Linux i386) - man page for cwd (redhat section 3pm)

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

NAME
       Cwd - get pathname of current working directory

SYNOPSIS
	   use Cwd;
	   my $dir = getcwd;

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

DESCRIPTION
       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.

       getcwd
	       my $cwd = getcwd();

	   Returns the current working directory.

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

	   Taint-safe.

       cwd
	       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).

	   Taint-safe.

       fastcwd
	       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.

       fastgetcwd
	     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.

       abs_path
	     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).

	   Taint-safe.

       realpath
	     my $abs_path = realpath($file);

	   A synonym for abs_path().

	   Taint-safe.

       fast_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
	   mode.

       $ENV{PWD}

       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.

NOTES
       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
	   concern.

       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()".

SEE ALSO
       File::chdir

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


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