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P5getpwnam cpan:ELIZABETH last updated on 2018-05-20

P5getpwnam-0.0.4/

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NAME

P5getpwnam - Implement Perl 5's getpwnam() and associated built-ins

SYNOPSIS

use P5getpwnam;

say "logged in as {getlogin || '(unknown)'}";

my @result = getpwnam(~$*USER);

DESCRIPTION

This module tries to mimic the behaviour of the getpwnam and associated functions of Perl 5 as closely as possible. It exports:

endpwent getlogin getpwent getpwnam getpwuid setpwent

ORIGINAL PERL 5 DOCUMENTATION

getpwnam NAME
getpwuid UID
getpwent
setpwent
endpwent
        These routines are the same as their counterparts in the system C
        library. In list context, the return values from the various get
        routines are as follows:

         # 0        1          2           3         4
         ( $name,   $passwd,   $uid,       $gid,     $quota,
         $comment,  $gcos,     $dir,       $shell,   $expire ) = getpw*
         # 5        6          7           8         9

        (If the entry doesn't exist you get an empty list.)

        The exact meaning of the $gcos field varies but it usually
        contains the real name of the user (as opposed to the login name)
        and other information pertaining to the user. Beware, however,
        that in many system users are able to change this information and
        therefore it cannot be trusted and therefore the $gcos is tainted
        (see perlsec). The $passwd and $shell, user's encrypted password
        and login shell, are also tainted, for the same reason.

        In scalar context, you get the name, unless the function was a
        lookup by name, in which case you get the other thing, whatever it
        is. (If the entry doesn't exist you get the undefined value.) For
        example:

            $uid   = getpwnam($name);
            $name  = getpwuid($num);

        In getpw*() the fields $quota, $comment, and $expire are special
        in that they are unsupported on many systems. If the $quota is
        unsupported, it is an empty scalar. If it is supported, it usually
        encodes the disk quota. If the $comment field is unsupported, it
        is an empty scalar. If it is supported it usually encodes some
        administrative comment about the user. In some systems the $quota
        field may be $change or $age, fields that have to do with password
        aging. In some systems the $comment field may be $class. The
        $expire field, if present, encodes the expiration period of the
        account or the password. For the availability and the exact
        meaning of these fields in your system, please consult getpwnam(3)
        and your system's pwd.h file. You can also find out from within
        Perl what your $quota and $comment fields mean and whether you
        have the $expire field by using the "Config" module and the values
        "d_pwquota", "d_pwage", "d_pwchange", "d_pwcomment", and
        "d_pwexpire". Shadow password files are supported only if your
        vendor has implemented them in the intuitive fashion that calling
        the regular C library routines gets the shadow versions if you're
        running under privilege or if there exists the shadow(3) functions
        as found in System V (this includes Solaris and Linux). Those
        systems that implement a proprietary shadow password facility are
        unlikely to be supported.

getlogin
        This implements the C library function of the same name, which on
        most systems returns the current login from /etc/utmp, if any. If
        it returns the empty string, use "getpwuid".

            $login = getlogin || getpwuid($<) || "Kilroy";

        Do not consider "getlogin" for authentication: it is not as secure
        as "getpwuid".

AUTHOR

Elizabeth Mattijsen liz@wenzperl.nl

Source can be located at: https://github.com/lizmat/P5getpwnam . Comments and Pull Requests are welcome.

COPYRIGHT AND LICENSE

Copyright 2018 Elizabeth Mattijsen

Re-imagined from Perl 5 as part of the CPAN Butterfly Plan.

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.