S<[ B<-cw> ] [ B<-d>[B<t>][:I<debugger>] ] [ B<-D>[I<number/list>] ]>
S<[ B<-pna> ] [ B<-F>I<pattern> ] [ B<-l>[I<octal>] ] [ B<-0>[I<octal/hexadecimal>] ]>
S<[ B<-I>I<dir> ] [ B<-m>[B<->]I<module> ] [ B<-M>[B<->]I<'module...'> ] [ B<-f> ]>
- S<[ B<-A>[I<module>][=I<assertions>] ]>
S<[ B<-C [I<number/list>] >]>
S<[ B<-P> ]>
S<[ B<-S> ]>
(This means that you cannot use the C<-x> with a directory name that
consists of hexadecimal digits.)
-=item B<-A[I<module>][=I<assertions>]>
-X<-A>
-
-Activates the assertions given after the equal sign as a comma-separated
-list of assertion names or regular expressions. If no assertion name
-is given, activates all assertions.
-
-The module L<assertions::activate> is used by default to activate the
-selected assertions. An alternate module may be specified including
-its name between the switch and the equal sign.
-
-See L<assertions> and L<assertions::activate>.
-
=item B<-a>
X<-a> X<autosplit>
=item B<-C [I<number/list>]>
X<-C>
-The C<-C> flag controls some Unicode of the Perl Unicode features.
+The C<-C> flag controls some of the Perl Unicode features.
As of 5.8.1, the C<-C> can be followed either by a number or a list
of option letters. The letters, their numeric values, and effects
512 r Regular expression parsing and execution
1024 x Syntax tree dump
2048 u Tainting checks
- 4096 (Obsolete, previously used for LEAKTEST)
+ 4096 U Unofficial, User hacking (reserved for private, unreleased use)
8192 H Hash dump -- usurps values()
16384 X Scratchpad allocation
32768 D Cleaning up
X<-P>
B<NOTE: Use of -P is strongly discouraged because of its inherent
-problems, including poor portability.>
+problems, including poor portability. It is deprecated and will be
+removed in a future version of Perl.>
This option causes your program to be run through the C preprocessor before
compilation by Perl. Because both comments and B<cpp> directives begin
operator instead. Note: availability of B<undump> is platform
specific and may not be available for a specific port of Perl.
-This switch has been superseded in favor of the new Perl code
-generator backends to the compiler. See L<B> and L<B::Bytecode>
-for details.
-
=item B<-U>
X<-U>
=item B<-x>
X<-x>
-=item B<-x> I<directory>
+=item B<-x>I<directory>
tells Perl that the program is embedded in a larger chunk of unrelated
ASCII text, such as in a mail message. Leading garbage will be
can process any or all of the trailing garbage via the DATA filehandle
if desired).
+The directory, if specified, must appear immediately following the B<-x>
+with no intervening whitespace.
+
=back
=head1 ENVIRONMENT
A list of directories in which to look for Perl library
files before looking in the standard library and the current
directory. Any architecture-specific directories under the specified
-locations are automatically included if they exist. If PERL5LIB is not
-defined, PERLLIB is used. Directories are separated (like in PATH) by
-a colon on unixish platforms and by a semicolon on Windows (the proper
-path separator being given by the command C<perl -V:path_sep>).
+locations are automatically included if they exist (this lookup
+being done at interpreter startup time.)
+
+If PERL5LIB is not defined, PERLLIB is used. Directories are separated
+(like in PATH) by a colon on unixish platforms and by a semicolon on
+Windows (the proper path separator being given by the command C<perl
+-V:path_sep>).
When running taint checks (either because the program was running setuid
-or setgid, or the B<-T> switch was used), neither variable is used.
-The program should instead say:
+or setgid, or the B<-T> or B<-t> switch was specified), neither variable
+is used. The program should instead say:
use lib "/my/directory";
X<PERL5OPT>
Command-line options (switches). Switches in this variable are taken
-as if they were on every Perl command line. Only the B<-[CDIMUdmtwA]>
+as if they were on every Perl command line. Only the B<-[CDIMUdmtw]>
switches are allowed. When running taint checks (because the program
was running setuid or setgid, or the B<-T> switch was used), this
variable is ignored. If PERL5OPT begins with B<-T>, tainting will be
environment variable) treats the colon as a separator.
An unset or empty PERLIO is equivalent to the default set of layers for
-your platforms, for example C<:unix:perlio>.
+your platform, for example C<:unix:perlio> on UNIX-like systems
+and C<:unix:crlf> on Windows and other DOS-like systems.
The list becomes the default for I<all> perl's IO. Consequently only built-in
layers can appear in this list, as external layers (such as :encoding()) need
=item PERL_HASH_SEED
X<PERL_HASH_SEED>
-(Since Perl 5.8.1.) Used to randomise Perl's internal hash function.
+(Since Perl 5.8.1.) Used to randomise perl's internal hash function.
To emulate the pre-5.8.1 behaviour, set to an integer (zero means
exactly the same order as 5.8.0). "Pre-5.8.1" means, among other
-things, that hash keys will be ordered the same between different runs
-of Perl.
+things, that hash keys will always have the same ordering between
+different runs of perl.
+
+Most hashes return elements in the same order as Perl 5.8.0 by default.
+On a hash by hash basis, if pathological data is detected during a hash
+key insertion, then that hash will switch to an alternative random hash
+seed.
The default behaviour is to randomise unless the PERL_HASH_SEED is set.
-If Perl has been compiled with C<-DUSE_HASH_SEED_EXPLICIT>, the default
+If perl has been compiled with C<-DUSE_HASH_SEED_EXPLICIT>, the default
behaviour is B<not> to randomise unless the PERL_HASH_SEED is set.
-If PERL_HASH_SEED is unset or set to a non-numeric string, Perl uses
+If PERL_HASH_SEED is unset or set to a non-numeric string, perl uses
the pseudorandom seed supplied by the operating system and libraries.
-This means that each different run of Perl will have a different
-ordering of the results of keys(), values(), and each().
B<Please note that the hash seed is sensitive information>. Hashes are
randomized to protect against local and remote attacks against Perl
projects / p5sagit/p5-mst-13.2.git / blobdiff