X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperldebug.pod;h=9eb0a9e3438b738179649c899c269b0a82eaa437;hb=f49ed1dab8c52e58c3b45270b50ae23e7886790c;hp=8d2e42c1bbcd44c95f0f16a7adfb74111c94b3c3;hpb=bea985324a3cd895f8e0a0c38e90ab3d09433415;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perldebug.pod b/pod/perldebug.pod
index 8d2e42c..9eb0a9e 100644
--- a/pod/perldebug.pod
+++ b/pod/perldebug.pod
@@ -39,6 +39,12 @@ Any command not recognized by the debugger is directly executed
 (C<eval>'d) as Perl code in the current package.  (The debugger
 uses the DB package for keeping its own state information.)
 
+Note that the said C<eval> is bound by an implicit scope. As a
+result any newly introduced lexical variable or any modified
+capture buffer content is lost after the eval. The debugger is a
+nice environment to learn Perl, but if you interactively experiment using
+material which should be in the same scope, stuff it in one line.
+
 For any text entered at the debugger prompt, leading and trailing whitespace
 is first stripped before further processing.  If a debugger command
 coincides with some function in your own program, merely precede the
@@ -99,7 +105,7 @@ temporarily set to I<N>.
 
 =item V [pkg [vars]]
 
-Display all (or some) variables in package (defaulting to C<main>) 
+Display all (or some) variables in package (defaulting to C<main>)
 using a data pretty-printer (hashes show their keys and values so
 you see what's what, control characters are made printable, etc.).
 Make sure you don't put the type specifier (like C<$>) there, just
@@ -193,7 +199,7 @@ executed, and print out that line.
 =item f filename
 
 Switch to viewing a different file or C<eval> statement.  If I<filename>
-is not a full pathname found in the values of %INC, it is considered 
+is not a full pathname found in the values of %INC, it is considered
 a regex.
 
 C<eval>ed strings (when accessible) are considered to be filenames:
@@ -267,7 +273,7 @@ subroutine is compiled.
 
 =item B line
 
-Delete a breakpoint from the specified I<line>.  
+Delete a breakpoint from the specified I<line>.
 
 =item B *
 
@@ -292,7 +298,7 @@ For example, this will print out $foo every time line
 
 =item A line
 
-Delete an action from the specified line.  
+Delete an action from the specified line.
 
 =item A *
 
@@ -301,7 +307,7 @@ Delete all installed actions.
 =item w expr
 
 Add a global watch-expression.  We hope you know what one of these
-is, because they're supposed to be obvious.  
+is, because they're supposed to be obvious.
 
 =item W expr
 
@@ -340,18 +346,21 @@ For historical reasons, the C<=value> is optional, but defaults to
 1 only where it is safe to do so--that is, mostly for Boolean
 options.  It is always better to assign a specific value using C<=>.
 The C<option> can be abbreviated, but for clarity probably should
-not be.  Several options can be set together.  See L<"Configurable Options"> 
+not be.  Several options can be set together.  See L<"Configurable Options">
 for a list of these.
 
-=item < ? 
+=item < ?
 
 List out all pre-prompt Perl command actions.
 
 =item < [ command ]
 
 Set an action (Perl command) to happen before every debugger prompt.
-A multi-line command may be entered by backslashing the newlines.  
-B<WARNING> If C<command> is missing, all actions are wiped out!
+A multi-line command may be entered by backslashing the newlines.
+
+=item < *
+
+Delete all pre-prompt Perl command actions.
 
 =item << command
 
@@ -367,8 +376,11 @@ List out post-prompt Perl command actions.
 Set an action (Perl command) to happen after the prompt when you've
 just given a command to return to executing the script.  A multi-line
 command may be entered by backslashing the newlines (we bet you
-couldn't've guessed this by now).  B<WARNING> If C<command> is
-missing, all actions are wiped out!
+couldn't've guessed this by now).
+
+=item > *
+
+Delete all post-prompt Perl command actions.
 
 =item >> command
 
@@ -383,14 +395,17 @@ List out pre-prompt debugger commands.
 =item { [ command ]
 
 Set an action (debugger command) to happen before every debugger prompt.
-A multi-line command may be entered in the customary fashion.  
-B<WARNING> If C<command> is missing, all actions are wiped out!
+A multi-line command may be entered in the customary fashion.
 
 Because this command is in some senses new, a warning is issued if
 you appear to have accidentally entered a block instead.  If that's
-what you mean to do, write it as with C<;{ ... }> or even 
+what you mean to do, write it as with C<;{ ... }> or even
 C<do { ... }>.
 
+=item { *
+
+Delete all pre-prompt debugger commands.
+
 =item {{ command
 
 Add an action (debugger command) to happen before every debugger prompt.
@@ -434,7 +449,7 @@ This is the only supported way to exit the debugger, though typing
 C<exit> twice might work.
 
 Set the C<inhibit_exit> option to 0 if you want to be able to step
-off the end the script.  You may also need to set $finished to 0 
+off the end the script.  You may also need to set $finished to 0
 if you want to step through global destruction.
 
 =item R
@@ -472,7 +487,7 @@ Perl debugger, use a leading semicolon, too.
 =item m expr
 
 List which methods may be called on the result of the evaluated
-expression.  The expression may evaluated to a reference to a 
+expression.  The expression may evaluated to a reference to a
 blessed object, or to a package name.
 
 =item M
@@ -654,7 +669,7 @@ include lexicals in a module's file scope, or lost in closures.
 =back
 
 After the rc file is read, the debugger reads the C<$ENV{PERLDB_OPTS}>
-environment variable and parses this as the remainder of a `O ...'
+environment variable and parses this as the remainder of a "O ..."
 line as one might enter at the debugger prompt.  You may place the
 initialization options C<TTY>, C<noTTY>, C<ReadLine>, and C<NonStop>
 there.
@@ -685,7 +700,7 @@ This module should implement a method named C<new> that returns an object
 with two methods: C<IN> and C<OUT>.  These should return filehandles to use
 for debugging input and output correspondingly.  The C<new> method should
 inspect an argument containing the value of C<$ENV{PERLDB_NOTTY}> at
-startup, or C<"/tmp/perldbtty$$"> otherwise.  This file is not 
+startup, or C<"$ENV{HOME}/.perldbtty$$"> otherwise.  This file is not
 inspected for proper ownership, so security hazards are theoretically
 possible.
 
@@ -946,7 +961,7 @@ time of this writing, however, that tool's eventual location in the
 Perl distribution was uncertain.
 
 Users of B<vi> should also look into B<vim> and B<gvim>, the mousey
-and windy version, for coloring of Perl keywords.  
+and windy version, for coloring of Perl keywords.
 
 Note that only perl can truly parse Perl, so all such CASE tools
 fall somewhat short of the mark, especially if you don't program
@@ -999,6 +1014,12 @@ L<Dumpvalue>,
 and
 L<perlrun>.
 
+When debugging a script that uses #! and is thus normally found in
+$PATH, the -S option causes perl to search $PATH for it, so you don't
+have to type the path or C<which $scriptname>.
+
+  $ perl -Sd foo.pl
+
 =head1 BUGS
 
 You cannot get stack frame information or in any fashion debug functions