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MAN page from CentOS 6 local-perl-PathTools-3.36-162.2.x86_64.rpm

Cwd

Section: Perl Programmers Reference Guide (3pm)
Updated: 2011-06-20
Index 

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 thecurrent working directory. 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(), andfastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace. 

getcwd and friends

Each of these functions are called without arguments and return theabsolute path of the current working directory.
getcwd
    my $cwd = getcwd();

Returns the current working directory.

Exposes the POSIX function getcwd(3) or re-implements it if it's notavailable.

cwd
    my $cwd = cwd();

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

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'tchdir() you back into. If fastcwd encounters a problem it will returnundef but will probably leave you in a different directory. For ameasure of extra security, if everything appears to have worked, thefastcwd() function will check that it leaves you in the same directorythat it started in. If it has changed it will "die" with the message``Unstable directory path, current directory changedunexpectedly''. That should never happen.

fastgetcwd
  my $cwd = fastgetcwd();

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

getdcwd
    my $cwd = getdcwd();    my $cwd = getdcwd('C:');

The getdcwd() function is also provided on Win32 to get the current workingdirectory on the specified drive, since Windows maintains a separate currentworking directory for each drive. If no drive is specified then the currentdrive is assumed.

This function simply calls the Microsoft C library _getdcwd() function.

 

abs_path and friends

These functions are exported only on request. They each take a singleargument and return the absolute pathname for it. If no argument isgiven they'll use the current working directory.
abs_path
  my $abs_path = abs_path($file);

Uses the same algorithm as getcwd(). Symbolic links and relative-pathcomponents (``.'' and ``..'') are resolved to return the canonicalpathname, just like realpath(3).

realpath
  my $abs_path = realpath($file);

A synonym for abs_path().

fast_abs_path
  my $abs_path = fast_abs_path($file);

A more dangerous, but potentially faster version of abs_path.

 

$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 thatit will only be kept up to date if all packages which use chdir importit from Cwd. 

NOTES

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

AUTHOR

Originally by the perl5-porters.

Maintained by Ken Williams <KWILLIAMSAATTcpan.org> 

COPYRIGHT

Copyright (c) 2004 by the Perl 5 Porters. All rights reserved.

This program is free software; you can redistribute it and/or modifyit under the same terms as Perl itself.

Portions of the C code in this library are copyright (c) 1994 by theRegents of the University of California. All rights reserved. Thelicense on this code is compatible with the licensing of the rest ofthe distribution - please see the source code in Cwd.xs for thedetails. 

SEE ALSO

File::chdir


 

Index

NAME
SYNOPSIS
DESCRIPTION
getcwd and friends
abs_path and friends
$ENV{PWD}
NOTES
AUTHOR
COPYRIGHT
SEE ALSO

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