1File::pushd(3)        User Contributed Perl Documentation       File::pushd(3)
2
3
4

NAME

6       File::pushd - change directory temporarily for a limited scope
7

VERSION

9       version 1.016
10

SYNOPSIS

12        use File::pushd;
13
14        chdir $ENV{HOME};
15
16        # change directory again for a limited scope
17        {
18            my $dir = pushd( '/tmp' );
19            # working directory changed to /tmp
20        }
21        # working directory has reverted to $ENV{HOME}
22
23        # tempd() is equivalent to pushd( File::Temp::tempdir )
24        {
25            my $dir = tempd();
26        }
27
28        # object stringifies naturally as an absolute path
29        {
30           my $dir = pushd( '/tmp' );
31           my $filename = File::Spec->catfile( $dir, "somefile.txt" );
32           # gives /tmp/somefile.txt
33        }
34

DESCRIPTION

36       File::pushd does a temporary "chdir" that is easily and automatically
37       reverted, similar to "pushd" in some Unix command shells.  It works by
38       creating an object that caches the original working directory.  When
39       the object is destroyed, the destructor calls "chdir" to revert to the
40       original working directory.  By storing the object in a lexical
41       variable with a limited scope, this happens automatically at the end of
42       the scope.
43
44       This is very handy when working with temporary directories for tasks
45       like testing; a function is provided to streamline getting a temporary
46       directory from File::Temp.
47
48       For convenience, the object stringifies as the canonical form of the
49       absolute pathname of the directory entered.
50
51       Warning: if you create multiple "pushd" objects in the same lexical
52       scope, their destruction order is not guaranteed and you might not wind
53       up in the directory you expect.
54

USAGE

56        use File::pushd;
57
58       Using File::pushd automatically imports the "pushd" and "tempd"
59       functions.
60
61   pushd
62        {
63            my $dir = pushd( $target_directory );
64        }
65
66       Caches the current working directory, calls "chdir" to change to the
67       target directory, and returns a File::pushd object.  When the object is
68       destroyed, the working directory reverts to the original directory.
69
70       The provided target directory can be a relative or absolute path. If
71       called with no arguments, it uses the current directory as its target
72       and returns to the current directory when the object is destroyed.
73
74       If the target directory does not exist or if the directory change fails
75       for some reason, "pushd" will die with an error message.
76
77       Can be given a hashref as an optional second argument.  The only
78       supported option is "untaint_pattern", which is used to untaint file
79       paths involved.  It defaults to {qr{^("" in -+@\w.+)$}}, which is
80       reasonably restrictive (e.g.  it does not even allow spaces in the
81       path).  Change this to suit your circumstances and security needs if
82       running under taint mode. *Note*: you must include the parentheses in
83       the pattern to capture the untainted portion of the path.
84
85   tempd
86        {
87            my $dir = tempd();
88        }
89
90       This function is like "pushd" but automatically creates and calls
91       "chdir" to a temporary directory created by File::Temp. Unlike normal
92       File::Temp cleanup which happens at the end of the program, this
93       temporary directory is removed when the object is destroyed. (But also
94       see "preserve".)  A warning will be issued if the directory cannot be
95       removed.
96
97       As with "pushd", "tempd" will die if "chdir" fails.
98
99       It may be given a single options hash that will be passed internally to
100       "pushd".
101
102   preserve
103        {
104            my $dir = tempd();
105            $dir->preserve;      # mark to preserve at end of scope
106            $dir->preserve(0);   # mark to delete at end of scope
107        }
108
109       Controls whether a temporary directory will be cleaned up when the
110       object is destroyed.  With no arguments, "preserve" sets the directory
111       to be preserved.  With an argument, the directory will be preserved if
112       the argument is true, or marked for cleanup if the argument is false.
113       Only "tempd" objects may be marked for cleanup.  (Target directories to
114       "pushd" are always preserved.)  "preserve" returns true if the
115       directory will be preserved, and false otherwise.
116

DIAGNOSTICS

118       "pushd" and "tempd" warn with message "Useless use of File::pushd::%s
119       in void context" if called in void context and the warnings category
120       "void" is enabled.
121
122         {
123           use warnings 'void';
124
125           pushd();
126         }
127

SEE ALSO

129       ·   File::chdir
130

SUPPORT

132   Bugs / Feature Requests
133       Please report any bugs or feature requests through the issue tracker at
134       <https://github.com/dagolden/File-pushd/issues>.  You will be notified
135       automatically of any progress on your issue.
136
137   Source Code
138       This is open source software.  The code repository is available for
139       public review and contribution under the terms of the license.
140
141       <https://github.com/dagolden/File-pushd>
142
143         git clone https://github.com/dagolden/File-pushd.git
144

AUTHOR

146       David Golden <dagolden@cpan.org>
147

CONTRIBUTORS

149       ·   Diab Jerius <djerius@cfa.harvard.edu>
150
151       ·   Graham Ollis <plicease@cpan.org>
152
153       ·   Olivier Mengué <dolmen@cpan.org>
154
155       ·   Shoichi Kaji <skaji@cpan.org>
156
158       This software is Copyright (c) 2018 by David A Golden.
159
160       This is free software, licensed under:
161
162         The Apache License, Version 2.0, January 2004
163
164
165
166perl v5.28.0                      2018-05-20                    File::pushd(3)
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