Skip test for changing TZ if running in a pseudo-fork (on Win32)

[p5sagit/p5-mst-13.2.git] / pod / perlrun.pod

diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index 74fd0ad..c3b30c8 100644 (file)
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -13,7 +13,7 @@ B<perl>       S<[ B<-sTtuUWX> ]>
        S<[ B<-S> ]>
        S<[ B<-x>[I<dir>] ]>
        S<[ B<-i>[I<extension>] ]>
-       S<[ B<-eE> I<'command'> ] [ B<--> ] [ I<programfile> ] [ I<argument> ]...>
+       S<[ [B<-e>|B<-E>] I<'command'> ] [ B<--> ] [ I<programfile> ] [ I<argument> ]...>
 
 =head1 DESCRIPTION
 
@@ -77,9 +77,10 @@ Parsing of the #! switches starts wherever "perl" is mentioned in the line.
 The sequences "-*" and "- " are specifically ignored so that you could,
 if you were so inclined, say
 
-    #!/bin/sh -- # -*- perl -*- -p
-    eval 'exec perl -wS $0 ${1+"$@"}'
-        if $running_under_some_shell;
+    #!/bin/sh
+    #! -*-perl-*-
+    eval 'exec perl -x -wS $0 ${1+"$@"}'
+        if 0;
 
 to let Perl see the B<-p> switch.
 
@@ -341,6 +342,11 @@ that enabled the use of Unicode-aware "wide system call" Win32 APIs.
 This feature was practically unused, however, and the command line
 switch was therefore "recycled".)
 
+B<Note:> Since perl 5.10.0, the -C option can no longer be used
+on the #! line. It wasn't working there anyway, since the standard streams
+are already set up at this point in the execution of the perl interpreter.
+You can use binmode() instead to get the desired behaviour.
+
 =item B<-c>
 X<-c>
 
@@ -395,7 +401,7 @@ B<-D14> is equivalent to B<-Dtls>):
        16  o  Method and overloading resolution
        32  c  String/numeric conversions
        64  P  Print profiling info, source file input state
-      128  m  Memory allocation
+      128  m  Memory and SV allocation
       256  f  Format processing
       512  r  Regular expression parsing and execution
      1024  x  Syntax tree dump
@@ -655,6 +661,10 @@ Note that the lines are not printed by default.  See B<-p> to have
 lines printed.  If a file named by an argument cannot be opened for
 some reason, Perl warns you about it and moves on to the next file.
 
+Also note that C<< <> >> passes command line arguments to
+L<perlfunc/open>, which doesn't necessarily interpret them as file names.
+See  L<perlop> for possible security implications.
+
 Here is an efficient way to delete all files that haven't been modified for
 at least a week:
 
@@ -899,6 +909,14 @@ 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
 discarded until the first line that starts with #! and contains the
 string "perl".  Any meaningful switches on that line will be applied.
+
+All references to line numbers by the program (warnings, errors, ...)
+will treat the #! line as the first line.
+Thus a warning on the 2nd line of the program (which is on the 100th
+line in the file) will be reported as line 2, and not as line 100.
+This can be overridden by using the #line directive.
+(See L<perlsyn/"Plain-Old-Comments-(Not!)">)
+
 If a directory name is specified, Perl will switch to that directory
 before running the program.  The B<-x> switch controls only the
 disposal of leading garbage.  The program must be terminated with
@@ -956,7 +974,7 @@ is used. The program should instead say:
 X<PERL5OPT>
 
 Command-line options (switches).  Switches in this variable are taken
-as if they were on every Perl command line.  Only the B<-[CDIMUdmtw]>
+as if they were on every Perl command line.  Only the B<-[CDIMUdmtwW]>
 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
@@ -1085,6 +1103,9 @@ compiler's numeric file descriptor routines. There is an experimental native
 C<win32> layer which is expected to be enhanced and should eventually be
 the default under Win32.
 
+The PERLIO environment variable is completely ignored when perl
+is run in taint mode.
+
 =item PERLIO_DEBUG
 X<PERLIO_DEBUG>
 
@@ -1109,6 +1130,9 @@ A list of directories in which to look for Perl library
 files before looking in the standard library and the current directory.
 If PERL5LIB is defined, PERLLIB is not used.
 
+The PERLLIB environment variable is completely ignored when perl
+is run in taint mode.
+
 =item PERL5DB
 X<PERL5DB>
 
@@ -1116,6 +1140,9 @@ The command used to load the debugger code.  The default is:
 
        BEGIN { require 'perl5db.pl' }
 
+The PERL5DB environment variable only used when perl is started with
+a bare B<-d> switch.
+
 =item PERL5DB_THREADED
 X<PERL5DB_THREADED>
 
@@ -1138,6 +1165,11 @@ fit for interactive use, and setting COMSPEC to such a shell may
 interfere with the proper functioning of other programs (which usually
 look in COMSPEC to find a shell fit for interactive use).
 
+Before Perl 5.10.0 and 5.8.8, PERL5SHELL was not taint checked
+when running external commands.  It is recommended that
+you explicitly set (or delete) C<$ENV{PERL5SHELL}> when running
+in taint mode under Windows.
+
 =item PERL_ALLOW_NON_IFS_LSP (specific to the Win32 port)
 X<PERL_ALLOW_NON_IFS_LSP>