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Man Pages
Unix::Passwd::File(3) User Contributed Perl Documentation Unix::Passwd::File(3)

Unix::Passwd::File - Manipulate /etc/{passwd,shadow,group,gshadow} entries

This document describes version 0.251 of Unix::Passwd::File (from Perl distribution Unix-Passwd-File), released on 2020-04-29.

 use Unix::Passwd::File;

 # list users. by default uses files in /etc (/etc/passwd, /etc/shadow, et al)
 my $res = list_users(); # [200, "OK", ["root", ...]]

 # change location of files, return details
 $res = list_users(etc_dir=>"/some/path", detail=>1);
     # [200, "OK", [{user=>"root", uid=>0, ...}, ...]]

 # also return detail, but return array entries instead of hash
 $res = list_users(detail=>1, with_field_names=>0);
     # [200, "OK", [["root", "x", 0, ...], ...]]

 # get user/group information
 $res = get_group(user=>"paijo"); # [200, "OK", {user=>"paijo", uid=>501, ...}]
 $res = get_user(user=>"titin");  # [404, "Not found"]

 # check whether user/group exists
 say user_exists(user=>"paijo");   # 1
 say group_exists(group=>"titin"); # 0

 # get all groups that user is member of
 $res = get_user_groups(user=>"paijo"); # [200, "OK", ["paijo", "satpam"]]

 # check whether user is member of a group
 $res = is_member(user=>"paijo", group=>"satpam"); # 1

 # adding user/group, by default adding user will also add a group with the same
 # name
 $res = add_user (user =>"ujang", ...); # [200, "OK", {uid=>540, gid=>541}]
 $res = add_group(group=>"ujang", ...); # [412, "Group already exists"]

 # modify user/group
 $res = modify_user(user=>"ujang", home=>"/newhome/ujang"); # [200, "OK"]
 $res = modify_group(group=>"titin"); # [404, "Not found"]

 # deleting user will also delete user's group
 $res = delete_user(user=>"titin");

 # change user password
 $res = set_user_password(user=>"ujang", pass=>"foobar");
 $res = modify_user(user=>"ujang", pass=>"foobar"); # same thing

 # add/delete user to/from group
 $res = add_user_to_group(user=>"ujang", group=>"wheel");
 $res = delete_user_from_group(user=>"ujang", group=>"wheel");

 # others
 $res = get_max_uid(); # [200, "OK", 65535]
 $res = get_max_gid(); # [200, "OK", 65534]

This module can be used to read and manipulate entries in Unix system password files (/etc/passwd, /etc/group, /etc/group, /etc/gshadow; but can also be told to search in custom location, for testing purposes).

This module uses a procedural (non-OO) interface. Each function in this module open and read the passwd files once. Read-only functions like `list_users()` and `get_max_gid()` open in read-only mode. Functions that might write to the files like `add_user()` or `delete_group()` first lock `passwd` file, open in read+write mode and also read the files in the first pass, then seek to the beginning and write back the files.

No caching is done so you should do your own if you need to.

Usage:

 add_delete_user_groups(%args) -> [status, msg, payload, meta]

Add or delete user from one or several groups.

This can be used to reduce several "add_user_to_group()" and/or "delete_user_from_group()" calls to a single call. So:

 add_delete_user_groups(user=>'u',add_to=>['a','b'],delete_from=>['c','d']);

is equivalent to:

 add_user_to_group     (user=>'u', group=>'a');
 add_user_to_group     (user=>'u', group=>'b');
 delete_user_from_group(user=>'u', group=>'c');
 delete_user_from_group(user=>'u', group=>'d');

except that "add_delete_user_groups()" does it in one pass.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • add_to => array[unix::groupname] (default: [])

    List of group names to add the user as member of.

  • delete_from => array[unix::groupname] (default: [])

    List of group names to remove the user as member of.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 add_group(%args) -> [status, msg, payload, meta]

Add a new group.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • gid => unix::gid

    Pick a specific new GID.

    Adding a new group with duplicate GID is allowed.

  • group* => unix::groupname
  • max_gid => int (default: 65535)

    Pick a range for new GID.

    If a free GID between "min_gid" and "max_gid" is not found, error 412 is returned.

  • members => any

    Fill initial members.

  • min_gid => int (default: 1000)

    Pick a range for new GID.

    If a free GID between "min_gid" and "max_gid" is not found, error 412 is returned.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 add_user(%args) -> [status, msg, payload, meta]

Add a new user.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • encpass => str

    Encrypted password.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • expire_date => int

    The date of expiration of the account, expressed as the number of days since Jan 1, 1970.

  • gecos => str

    Usually, it contains the full username.

  • gid => int

    Pick a specific GID when creating group.

    Duplicate GID is allowed.

  • group => unix::groupname

    Select primary group (default is group with same name as user).

    Normally, a user's primary group with group with the same name as user, which will be created if does not already exist. You can pick another group here, which must already exist (and in this case, the group with the same name as user will not be created).

  • home => dirname

    User's home directory.

  • last_pwchange => int

    The date of the last password change, expressed as the number of days since Jan 1, 1970.

  • max_gid => int

    Pick a range for GID when creating group.

  • max_pass_age => int

    The number of days after which the user will have to change her password.

  • max_uid => int (default: 65535)

    Pick a range for new UID.

    If a free UID between "min_uid" and "max_uid" is not found, error 412 is returned.

  • min_gid => int

    Pick a range for GID when creating group.

  • min_pass_age => int

    The number of days the user will have to wait before she will be allowed to change her password again.

  • min_uid => int (default: 1000)

    Pick a range for new UID.

    If a free UID between "min_uid" and "max_uid" is not found, error 412 is returned.

  • pass => str

    Password, generally should be "x" which means password is encrypted in shadow.

  • pass_inactive_period => int

    The number of days after a password has expired (see max_pass_age) during which the password should still be accepted (and user should update her password during the next login).

  • pass_warn_period => int

    The number of days before a password is going to expire (see max_pass_age) during which the user should be warned.

  • shell => filename

    User's shell.

  • uid => int

    Pick a specific new UID.

    Adding a new user with duplicate UID is allowed.

  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 add_user_to_group(%args) -> [status, msg, payload, meta]

Add user to a group.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • group* => unix::groupname
  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 delete_group(%args) -> [status, msg, payload, meta]

Delete a group.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • group* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 delete_user(%args) -> [status, msg, payload, meta]

Delete a user.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 delete_user_from_group(%args) -> [status, msg, payload, meta]

Delete user from a group.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • group* => unix::groupname
  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 get_group(%args) -> [status, msg, payload, meta]

Get group details by group name or gid.

Either "group" OR "gid" must be specified.

The function is not dissimilar to Unix's "getgrnam()" or "getgrgid()".

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • gid => unix::gid
  • group => unix::username
  • with_field_names => bool (default: 1)

    If false, don't return hash.

    By default, a hashref is returned containing field names and its values, e.g. "{group=>"titin", pass=>"x", gid=>500, ...}". With "with_field_names=>0", an arrayref is returned instead: "["titin", "x", 500, ...]".

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 get_max_gid(%args) -> [status, msg, payload, meta]

Get maximum GID used.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

etc_dir => str (default: "/etc")

Specify location of passwd files.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 get_max_uid(%args) -> [status, msg, payload, meta]

Get maximum UID used.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

etc_dir => str (default: "/etc")

Specify location of passwd files.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 get_user(%args) -> [status, msg, payload, meta]

Get user details by username or uid.

Either "user" OR "uid" must be specified.

The function is not dissimilar to Unix's "getpwnam()" or "getpwuid()".

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • uid => unix::uid
  • user => unix::username
  • with_field_names => bool (default: 1)

    If false, don't return hash.

    By default, a hashref is returned containing field names and its values, e.g. "{user=>"titin", pass=>"x", uid=>500, ...}". With "with_field_names=>0", an arrayref is returned instead: "["titin", "x", 500, ...]".

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 get_user_groups(%args) -> [status, msg, payload, meta]

Return groups which the user belongs to.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • detail => bool (default: 0)

    If true, return all fields instead of just group names.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • user* => unix::username
  • with_field_names => bool (default: 1)

    If false, don't return hash for each entry.

    By default, when "detail=>1", a hashref is returned for each entry containing field names and its values, e.g. "{group=>"titin", pass=>"x", gid=>500, ...}". With "with_field_names=>0", an arrayref is returned instead: "["titin", "x", 500, ...]".

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 group_exists(%args) -> bool

Check whether group exists.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • gid => unix::gid
  • group => unix::groupname

Return value: (bool)

Usage:

 is_member(%args) -> bool

Check whether user is member of a group.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • group* => unix::groupname
  • user* => unix::username

Return value: (bool)

Usage:

 list_groups(%args) -> [status, msg, payload, meta]

List Unix groups in group file.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • detail => bool (default: 0)

    If true, return all fields instead of just group names.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • with_field_names => bool (default: 1)

    If false, don't return hash for each entry.

    By default, when "detail=>1", a hashref is returned for each entry containing field names and its values, e.g. "{group=>"titin", pass=>"x", gid=>500, ...}". With "with_field_names=>0", an arrayref is returned instead: "["titin", "x", 500, ...]".

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 list_users(%args) -> [status, msg, payload, meta]

List Unix users in passwd file.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • detail => bool (default: 0)

    If true, return all fields instead of just usernames.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • with_field_names => bool (default: 1)

    If false, don't return hash for each entry.

    By default, when "detail=>1", a hashref is returned for each entry containing field names and its values, e.g. "{user=>"titin", pass=>"x", uid=>500, ...}". With "with_field_names=>0", an arrayref is returned instead: "["titin", "x", 500, ...]".

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 list_users_and_groups(%args) -> [status, msg, payload, meta]

List Unix users and groups in passwd/group files.

This is basically "list_users()" and "list_groups()" combined, so you can get both data in a single call. Data is returned in an array. Users list is in the first element, groups list in the second.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • detail => bool (default: 0)

    If true, return all fields instead of just names.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • with_field_names => bool (default: 1)

    If false, don't return hash for each entry.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 modify_group(%args) -> [status, msg, payload, meta]

Modify an existing group.

Specify arguments to modify corresponding fields. Unspecified fields will not be modified.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • admins => str

    It must be a comma-separated list of user names, or empty.

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • encpass => str

    Encrypted password.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • gid => unix::gid

    Numeric group ID.

  • group* => unix::groupname

    Group name.

  • members => str

    List of usernames that are members of this group, separated by commas.

  • pass => str

    Password, generally should be "x" which means password is encrypted in gshadow.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 modify_user(%args) -> [status, msg, payload, meta]

Modify an existing user.

Specify arguments to modify corresponding fields. Unspecified fields will not be modified.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • encpass => str

    Encrypted password.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • expire_date => int

    The date of expiration of the account, expressed as the number of days since Jan 1, 1970.

  • gecos => str

    Usually, it contains the full username.

  • gid => unix::gid

    Numeric primary group ID for this user.

  • home => dirname

    User's home directory.

  • last_pwchange => int

    The date of the last password change, expressed as the number of days since Jan 1, 1970.

  • max_pass_age => int

    The number of days after which the user will have to change her password.

  • min_pass_age => int

    The number of days the user will have to wait before she will be allowed to change her password again.

  • pass_inactive_period => int

    The number of days after a password has expired (see max_pass_age) during which the password should still be accepted (and user should update her password during the next login).

  • pass_warn_period => int

    The number of days before a password is going to expire (see max_pass_age) during which the user should be warned.

  • shell => filename

    User's shell.

  • uid => unix::uid

    Numeric user ID.

  • user* => unix::username

    User (login) name.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 set_user_groups(%args) -> [status, msg, payload, meta]

Set the groups that a user is member of.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • groups* => array[unix::groupname] (default: [])

    List of group names that user is member of.

    Aside from this list, user will not belong to any other group.

  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 set_user_password(%args) -> [status, msg, payload, meta]

Set user's password.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • backup => bool (default: 0)

    Whether to backup when modifying files.

    Backup is written with ".bak" extension in the same directory. Unmodified file will not be backed up. Previous backup will be overwritten.

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • pass* => str
  • user* => unix::username

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

Usage:

 user_exists(%args) -> bool

Check whether user exists.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • etc_dir => str (default: "/etc")

    Specify location of passwd files.

  • uid => unix::uid
  • user => unix::username

Return value: (bool)

Please visit the project's homepage at <https://metacpan.org/release/Unix-Passwd-File>.

Source repository is at <https://github.com/perlancar/perl-Unix-Passwd-File>.

Please report any bugs or feature requests on the bugtracker website <https://rt.cpan.org/Public/Dist/Display.html?Name=Unix-Passwd-File>

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

Old modules on CPAN which do not support shadow files are pretty useless to me (e.g. Unix::ConfigFile). Shadow passwords have been around since 1988 (and in Linux since 1992), FFS!

Passwd::Unix. I created a fork of Passwd::Unix v0.52 called Passwd::Unix::Alt in 2011 to fix some of the deficiencies/quirks in Passwd::Unix, including: lack of tests, insistence of running as root (despite allowing custom passwd files), use of not-so-ubiquitous bzip2, etc. Then in 2012 I decided to create Unix::Passwd::File. Here are how Unix::Passwd::File differs compared to Passwd::Unix (and Passwd::Unix::Alt):

  • tests in distribution
  • no need to run as root
  • no need to be able to read the shadow file for some operations

    For example, "list_users()" will simply not return the "encpass" field if the shadow file is unreadable. Of course, access to shadow file is required when getting or setting password.

  • strictly procedural (non-OO) interface

    I consider this a feature :-)

  • detailed error message for each operation
  • removal of global error variable
  • working locking

    Locking is done by locking "passwd" file.

Setup::Unix::User and Setup::Unix::Group, which use this module.

Rinci

perlancar <perlancar@cpan.org>

This software is copyright (c) 2020, 2017, 2016, 2015, 2014, 2012 by perlancar@cpan.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2020-04-29 perl v5.32.1

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