[DOC PATCH] was Re: things deprecated for removal in 5.12

[perl5.git] / pod / perlvar.pod

diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index e9c1e9f..6e62a10 100644 (file)
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -58,14 +58,14 @@ the change may affect other modules which rely on the default values
 of the special variables that you have changed. This is one of the
 correct ways to read the whole file at once:
 
-    open my $fh, "foo" or die $!;
+    open my $fh, "<", "foo" or die $!;
     local $/; # enable localized slurp mode
     my $content = <$fh>;
     close $fh;
 
 But the following code is quite bad:
 
-    open my $fh, "foo" or die $!;
+    open my $fh, "<", "foo" or die $!;
     undef $/; # enable slurp mode
     my $content = <$fh>;
     close $fh;
@@ -81,7 +81,7 @@ inside some short C<{}> block, you should create one yourself. For
 example:
 
     my $content = '';
-    open my $fh, "foo" or die $!;
+    open my $fh, "<", "foo" or die $!;
     {
         local $/;
         $content = <$fh>;
@@ -148,18 +148,24 @@ don't use it:
 
 =item *
 
-Various unary functions, including functions like ord() and int(), as well
-as the all file tests (C<-f>, C<-d>) except for C<-t>, which defaults to
-STDIN.
+The following functions:
+
+abs, alarm, chomp, chop, chr, chroot, cos, defined, eval, exp, glob,
+hex, int, lc, lcfirst, length, log, lstat, mkdir, oct, ord, pos, print,
+quotemeta, readlink, readpipe, ref, require, reverse (in scalar context only),
+rmdir, sin, split (on its second argument), sqrt, stat, study, uc, ucfirst, 
+unlink, unpack.
 
 =item *
 
-Various list functions like print() and unlink().
+All file tests (C<-f>, C<-d>) except for C<-t>, which defaults to STDIN.
+See L<perlfunc/-X>
+
 
 =item *
 
-The pattern matching operations C<m//>, C<s///>, and C<tr///> when used
-without an C<=~> operator.
+The pattern matching operations C<m//>, C<s///> and C<tr///> (aka C<y///>)
+when used without an C<=~> operator.
 
 =item *
 
@@ -172,6 +178,10 @@ The implicit iterator variable in the grep() and map() functions.
 
 =item *
 
+The implicit variable of given().
+
+=item *
+
 The default place to put an input record when a C<< <FH> >>
 operation's result is tested by itself as the sole criterion of a C<while>
 test.  Outside a C<while> test, this will not happen.
@@ -181,7 +191,7 @@ test.  Outside a C<while> test, this will not happen.
 As C<$_> is a global variable, this may lead in some cases to unwanted
 side-effects.  As of perl 5.9.1, you can now use a lexical version of
 C<$_> by declaring it in a file or in a block with C<my>.  Moreover,
-declaring C<our $> restores the global C<$_> in the current scope.
+declaring C<our $_> restores the global C<$_> in the current scope.
 
 (Mnemonic: underline is understood in certain operations.)
 
@@ -433,7 +443,7 @@ instead of lines, with the maximum record size being the referenced
 integer.  So this:
 
     local $/ = \32768; # or \"32768", or \$var_containing_32768
-    open my $fh, $myfile or die $!;
+    open my $fh, "<", $myfile or die $!;
     local $_ = <$fh>;
 
 will read a record of no more than 32768 bytes from FILE.  If you're
@@ -469,7 +479,8 @@ buffered otherwise.  Setting this variable is useful primarily when
 you are outputting to a pipe or socket, such as when you are running
 a Perl program under B<rsh> and want to see the output as it's
 happening.  This has no effect on input buffering.  See L<perlfunc/getc>
-for that.  (Mnemonic: when you want your pipes to be piping hot.)
+for that.  See L<perldoc/select> on how to select the output channel. 
+See also L<IO::Handle>. (Mnemonic: when you want your pipes to be piping hot.)
 
 =item IO::Handle->output_field_separator EXPR
 
@@ -780,7 +791,7 @@ variable, or in other words, if a system or library call fails, it
 sets this variable.  This means that the value of C<$!> is meaningful
 only I<immediately> after a B<failure>:
 
-    if (open(FH, $filename)) {
+    if (open my $fh, "<", $filename) {
        # Here $! is meaningless.
        ...
     } else {
@@ -1314,15 +1325,12 @@ switch); see L<perlrun> for more info on this.
 X<$^V> X<$PERL_VERSION>
 
 The revision, version, and subversion of the Perl interpreter, represented
-as a string composed of characters with those ordinals.  Thus in Perl v5.6.0
-it equals C<chr(5) . chr(6) . chr(0)> and will return true for
-C<$^V eq v5.6.0>.  Note that the characters in this string value can
-potentially be greater than 255.
+as a C<version> object.
 
 This variable first appeared in perl 5.6.0; earlier versions of perl will
-see an undefined value.
+see an undefined value. Before perl 5.10.0 $^V was represented as a v-string.
 
-This can be used to determine whether the Perl interpreter executing a
+$^V can be used to determine whether the Perl interpreter executing a
 script is in the right range of versions.  (Mnemonic: use ^V for Version
 Control.)  Example: