1User::grent(3pm) Perl Programmers Reference Guide User::grent(3pm)
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6 User::grent - by-name interface to Perl's built-in getgr*() functions
7
9 use User::grent;
10 $gr = getgrgid(0) or die "No group zero";
11 if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) {
12 print "gid zero name wheel, with other members";
13 }
14 use User::grent qw(:FIELDS);
16 getgrgid(0) or die "No group zero";
17 if ( $gr_name eq 'wheel' && @gr_members > 1 ) {
18 print "gid zero name wheel, with other members";
19 }
20 $gr = getgr($whoever);
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24 This module's default exports override the core getgrent(), getgruid(),
25 and getgrnam() functions, replacing them with versions that return
26 "User::grent" objects. This object has methods that return the
27 similarly named structure field name from the C's passwd structure from
28 grp.h; namely name, passwd, gid, and members (not mem). The first
29 three return scalars, the last an array reference.
30 You may also import all the structure fields directly into your
32 namespace as regular variables using the :FIELDS import tag. (Note
33 that this still overrides your core functions.) Access these fields as
34 variables named with a preceding "gr_". Thus, "$group_obj->gid()"
35 corresponds to $gr_gid if you import the fields. Array references are
36 available as regular array variables, so "@{ $group_obj->members() }"
37 would be simply @gr_members.
38 The getpw() function is a simple front-end that forwards a numeric
40 argument to getpwuid() and the rest to getpwnam().
41 To access this functionality without the core overrides, pass the "use"
43 an empty import list, and then access function functions with their
44 full qualified names. On the other hand, the built-ins are still
45 available via the "CORE::" pseudo-package.
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48 While this class is currently implemented using the Class::Struct
49 module to build a struct-like class, you shouldn't rely upon this.
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52 Tom Christiansen
53perl v5.12.4 2011-06-01 User::grent(3pm)