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=item C<getgid>

Returns the user's real group identifier.  Similar to Perl's builtin
variable C<$)>, see L<perlvar/$GID>.

=item C<getgrgid>

This is identical to Perl's builtin C<getgrgid()> function for
returning group entries by group identifiers, see
L<perlfunc/getgrgid>.

=item C<getgrnam>

This is identical to Perl's builtin C<getgrnam()> function for
returning group entries by group names, see L<perlfunc/getgrnam>.

=item C<getgroups>

Returns the ids of the user's supplementary groups.  Similar to Perl's
builtin variable C<$)>, see L<perlvar/$GID>.

=item C<getlogin>

This is identical to Perl's builtin C<getlogin()> function for
returning the user name associated with the current session, see
L<perlfunc/getlogin>.

=item C<getpayload>

	use POSIX ':nan_payload';
	getpayload($var)

Returns the C<NaN> payload.  Added in Perl v5.24.

Note the API instability warning in L</setpayload>.

See L</nan> for more discussion about C<NaN>.

=item C<getpgrp>

This is identical to Perl's builtin C<getpgrp()> function for
returning the process group identifier of the current process, see
L<perlfunc/getpgrp>.

=item C<getpid>

Returns the process identifier.  Identical to Perl's builtin
variable C<$$>, see L<perlvar/$PID>.

=item C<getppid>

This is identical to Perl's builtin C<getppid()> function for
returning the process identifier of the parent process of the current
process , see L<perlfunc/getppid>.

=item C<getpwnam>

This is identical to Perl's builtin C<getpwnam()> function for
returning user entries by user names, see L<perlfunc/getpwnam>.

=item C<getpwuid>

This is identical to Perl's builtin C<getpwuid()> function for
returning user entries by user identifiers, see L<perlfunc/getpwuid>.

=item C<gets>

Returns one line from C<STDIN>, similar to E<lt>E<gt>, also known
as the C<readline()> function, see L<perlfunc/readline>.

B<NOTE>: if you have C programs that still use C<gets()>, be very
afraid.  The C<gets()> function is a source of endless grief because
it has no buffer overrun checks.  It should B<never> be used.  The
C<fgets()> function should be preferred instead.

=item C<getuid>

Returns the user's identifier.  Identical to Perl's builtin C<$E<lt>> variable,
see L<perlvar/$UID>.

=item C<gmtime>

This is identical to Perl's builtin C<gmtime()> function for
converting seconds since the epoch to a date in Greenwich Mean Time,
see L<perlfunc/gmtime>.

=item C<hypot>

Equivalent to C<S<sqrt(x * x + y * y)>> except more stable on very large
or very small arguments [C99].  Added in Perl v5.22.

=item C<ilogb>

Integer binary logarithm [C99].  Added in Perl v5.22.

For example C<ilogb(20)> is 4, as an integer.

See also L</logb>.

=item C<Inf>

The infinity as a constant:

   use POSIX qw(Inf);
   my $pos_inf = +Inf;  # Or just Inf.
   my $neg_inf = -Inf;

See also L</isinf>, and L</fpclassify>.

=item C<isalnum>

This function has been removed as of Perl v5.24.  It was very similar to
matching against S<C<qr/ ^ [[:alnum:]]+ $ /x>>, which you should convert
to use instead.  See L<perlrecharclass/POSIX Character Classes>.

=item C<isalpha>

This function has been removed as of Perl v5.24.  It was very similar to
matching against S<C<qr/ ^ [[:alpha:]]+ $ /x>>, which you should convert
to use instead.  See L<perlrecharclass/POSIX Character Classes>.

=item C<isatty>

Returns a boolean indicating whether the specified filehandle is connected