MirBSD manpage: Cwd(3p)
Cwd(3p) Perl Programmers Reference Guide Cwd(3p)
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 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(), and fastgetcwd() (and, on Win32, getdcwd()) 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.
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).
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 secu-
rity, if everything appears to have worked, the
fastcwd() function will check that it leaves you in the
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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.
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 working directory on the specified drive,
since Windows maintains a separate current working
directory for each drive. If no drive is specified then
the current drive 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 single argument and return the absolute pathname for
it. If no argument is given 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-path components ("." and "..") are resolved to
return the canonical pathname, 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.
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$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.
+ Since the path seperators are different on some operat-
ing systems ('/' on Unix, ':' on MacPerl, etc...) we
recommend you use the File::Spec modules wherever porta-
bility 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()".
Originally by the perl5-porters.
Maintained by Ken Williams <KWILLIAMS@cpan.org>
Copyright (c) 2004 by the Perl 5 Porters. All rights
reserved.
This program is free software; you can redistribute it
and/or modify it under the same terms as Perl itself.
Portions of the C code in this library are copyright (c)
1994 by the Regents of the University of California. All
rights reserved. The license on this code is compatible
with the licensing of the rest of the distribution - please
see the source code in Cwd.xs for the details.
File::chdir
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