=over =item defined EXPR X<defined> X<undef> X<undefined> =item defined Returns a Boolean value telling whether EXPR has a value other than the undefined value L<C<undef>|/undef EXPR>. If EXPR is n...

=over =item package NAMESPACE =item package NAMESPACE VERSION X<package> X<module> X<namespace> X<version> =item package NAMESPACE BLOCK =item package NAMESPACE VERSION BLOCK X<package> X<module> X...

=over =item semop KEY,OPSTRING X<semop> Calls the System V IPC function L<semop(2)> for semaphore operations such as signalling and waiting. OPSTRING must be a packed array of semop structures. Eac...

=over =item chroot FILENAME X<chroot> X<root> =item chroot This function works like the system call by the same name: it makes the named directory the new root directory for all further pathnames t...

=over =item rmdir FILENAME X<rmdir> X<rd> X<directory, remove> =item rmdir Deletes the directory specified by FILENAME if that directory is empty. If it succeeds it returns true; otherwise it retur...

=over =item telldir DIRHANDLE X<telldir> Returns the current position of the L<C<readdir>|/readdir DIRHANDLE> routines on DIRHANDLE. Value may be given to L<C<seekdir>|/seekdir DIRHANDLE,POS> to ac...

=over =item field VARNAME X<field> Declares a new field variable within the current class. Methods and C<ADJUST> blocks of the class will have access to this variable as if it was a lexical in scop...

=head1 NAME perlpacktut - tutorial on C<pack> and C<unpack> =head1 DESCRIPTION C<pack> and C<unpack> are two functions for transforming data according to a user-defined template, between the guarde...

=head1 NAME X<tie> perltie - how to hide an object class in a simple variable =head1 SYNOPSIS tie VARIABLE, CLASSNAME, LIST $object = tied VARIABLE untie VARIABLE =head1 DESCRIPTION Prior to releas...

=head1 NAME perltrap - Perl traps for the unwary =head1 DESCRIPTION The biggest trap of all is forgetting to C<use warnings> or use the B<-w> switch; see L<warnings> and L<perlrun/-w>. The second b...