perldebug.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

Continue until the return from the current subroutine.
Dump the return value if the \f(CW\*(C`PrintRet\*(C'\fR option is set (default).
.IP "<\s-1CR\s0>" 12
.IX Item "<CR>"
Repeat last \f(CW\*(C`n\*(C'\fR or \f(CW\*(C`s\*(C'\fR command.
.IP "c [line|sub]" 12
.IX Xref "debugger command, c"
.IX Item "c [line|sub]"
Continue, optionally inserting a one-time-only breakpoint
at the specified line or subroutine.
.IP "l" 12
.IX Xref "debugger command, l"
.IX Item "l"
List next window of lines.
.IP "l min+incr" 12
.IX Item "l min+incr"
List \f(CW\*(C`incr+1\*(C'\fR lines starting at \f(CW\*(C`min\*(C'\fR.
.IP "l min-max" 12
.IX Item "l min-max"
List lines \f(CW\*(C`min\*(C'\fR through \f(CW\*(C`max\*(C'\fR.  \f(CW\*(C`l \-\*(C'\fR is synonymous to \f(CW\*(C`\-\*(C'\fR.
.IP "l line" 12
.IX Item "l line"
List a single line.
.IP "l subname" 12
.IX Item "l subname"
List first window of lines from subroutine.  \fIsubname\fR may
be a variable that contains a code reference.
.IP "\-" 12
.IX Xref "debugger command, -"
List previous window of lines.
.IP "v [line]" 12
.IX Xref "debugger command, v"
.IX Item "v [line]"
View a few lines of code around the current line.
.IP "." 12
.IX Xref "debugger command, ."
Return the internal debugger pointer to the line last
executed, and print out that line.
.IP "f filename" 12
.IX Xref "debugger command, f"
.IX Item "f filename"
Switch to viewing a different file or \f(CW\*(C`eval\*(C'\fR statement.  If \fIfilename\fR
is not a full pathname found in the values of \f(CW%INC\fR, it is considered
a regex.
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\&\f(CW\*(C`eval\*(C'\fRed strings (when accessible) are considered to be filenames:
\&\f(CW\*(C`f (eval 7)\*(C'\fR and \f(CW\*(C`f eval 7\eb\*(C'\fR access the body of the 7th \f(CW\*(C`eval\*(C'\fRed string
(in the order of execution).  The bodies of the currently executed \f(CW\*(C`eval\*(C'\fR
and of \f(CW\*(C`eval\*(C'\fRed strings that define subroutines are saved and thus
accessible.
.IP "/pattern/" 12
.IX Item "/pattern/"
Search forwards for pattern (a Perl regex); final / is optional.
The search is case-insensitive by default.
.IP "?pattern?" 12
.IX Item "?pattern?"
Search backwards for pattern; final ? is optional.
The search is case-insensitive by default.
.IP "L [abw]" 12
.IX Xref "debugger command, L"
.IX Item "L [abw]"
List (default all) actions, breakpoints and watch expressions
.IP "S [[!]regex]" 12
.IX Xref "debugger command, S"
.IX Item "S [[!]regex]"
List subroutine names [not] matching the regex.
.IP "t" 12
.IX Xref "debugger command, t"
.IX Item "t"
Toggle trace mode (see also the \f(CW\*(C`AutoTrace\*(C'\fR option).
.IP "t expr" 12
.IX Xref "debugger command, t"
.IX Item "t expr"
Trace through execution of \f(CW\*(C`expr\*(C'\fR.
See \*(L"Frame Listing Output Examples\*(R" in perldebguts for examples.
.IP "b" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b"
Sets breakpoint on current line
.IP "b [line] [condition]" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b [line] [condition]"
Set a breakpoint before the given line.  If a condition
is specified, it's evaluated each time the statement is reached: a
breakpoint is taken only if the condition is true.  Breakpoints may
only be set on lines that begin an executable statement.  Conditions
don't use \f(CW\*(C`if\*(C'\fR:
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.Vb 3
\&    b 237 $x > 30
\&    b 237 ++$count237 < 11
\&    b 33 /pattern/i
.Ve
.IP "b subname [condition]" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b subname [condition]"
Set a breakpoint before the first line of the named subroutine.  \fIsubname\fR may
be a variable containing a code reference (in this case \fIcondition\fR
is not supported).
.IP "b postpone subname [condition]" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b postpone subname [condition]"
Set a breakpoint at first line of subroutine after it is compiled.
.IP "b load filename" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b load filename"
Set a breakpoint before the first executed line of the \fIfilename\fR,
which should be a full pathname found amongst the \f(CW%INC\fR values.
.IP "b compile subname" 12
.IX Xref "breakpoint debugger command, b"
.IX Item "b compile subname"
Sets a breakpoint before the first statement executed after the specified
subroutine is compiled.
.IP "B line" 12
.IX Xref "breakpoint debugger command, B"
.IX Item "B line"
Delete a breakpoint from the specified \fIline\fR.
.IP "B *" 12
.IX Xref "breakpoint debugger command, B"
.IX Item "B *"
Delete all installed breakpoints.
.IP "a [line] command" 12
.IX Xref "debugger command, a"
.IX Item "a [line] command"
Set an action to be done before the line is executed.  If \fIline\fR is
omitted, set an action on the line about to be executed.
The sequence of steps taken by the debugger is
.Sp
.Vb 5
\&  1. check for a breakpoint at this line
\&  2. print the line if necessary (tracing)
\&  3. do any actions associated with that line
\&  4. prompt user if at a breakpoint or in single\-step
\&  5. evaluate line
.Ve
.Sp
For example, this will print out \f(CW$foo\fR every time line
53 is passed:
.Sp
.Vb 1
\&    a 53 print "DB FOUND $foo\en"
.Ve
.IP "A line" 12
.IX Xref "debugger command, A"
.IX Item "A line"
Delete an action from the specified line.
.IP "A *" 12
.IX Xref "debugger command, A"
.IX Item "A *"
Delete all installed actions.
.IP "w expr" 12
.IX Xref "debugger command, w"
.IX Item "w expr"
Add a global watch-expression.  We hope you know what one of these
is, because they're supposed to be obvious.
.IP "W expr" 12
.IX Xref "debugger command, W"
.IX Item "W expr"
Delete watch-expression
.IP "W *" 12
.IX Xref "debugger command, W"
.IX Item "W *"
Delete all watch-expressions.
.IP "o" 12
.IX Xref "debugger command, o"
.IX Item "o"
Display all options
.IP "o booloption ..." 12
.IX Xref "debugger command, o"
.IX Item "o booloption ..."
Set each listed Boolean option to the value \f(CW1\fR.
.IP "o anyoption? ..." 12
.IX Xref "debugger command, o"
.IX Item "o anyoption? ..."
Print out the value of one or more options.
.IP "o option=value ..." 12
.IX Xref "debugger command, o"
.IX Item "o option=value ..."
Set the value of one or more options.  If the value has internal
whitespace, it should be quoted.  For example, you could set \f(CW\*(C`o
pager="less \-MQeicsNfr"\*(C'\fR to call \fBless\fR with those specific options.
You may use either single or double quotes, but if you do, you must
escape any embedded instances of same sort of quote you began with,
as well as any escaping any escapes that immediately precede that
quote but which are not meant to escape the quote itself.  In other
words, you follow single-quoting rules irrespective of the quote;
eg: \f(CW\*(C`o option=\*(Aqthis isn\e\*(Aqt bad\*(Aq\*(C'\fR or \f(CW\*(C`o option="She said, \e"Isn\*(Aqt
it?\e""\*(C'\fR.
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For historical reasons, the \f(CW\*(C`=value\*(C'\fR 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 \f(CW\*(C`=\*(C'\fR.
The \f(CW\*(C`option\*(C'\fR can be abbreviated, but for clarity probably should
not be.  Several options can be set together.  See \*(L"Configurable Options\*(R"
for a list of these.
.IP "< ?" 12
.IX Xref "debugger command, <"
List out all pre-prompt Perl command actions.
.IP "< [ command ]" 12
.IX Xref "debugger command, <"
.IX Item "< [ command ]"
Set an action (Perl command) to happen before every debugger prompt.
A multi-line command may be entered by backslashing the newlines.
.IP "< *" 12
.IX Xref "debugger command, <"
Delete all pre-prompt Perl command actions.
.IP "<< command" 12
.IX Xref "debugger command, <<"
.IX Item "<< command"
Add an action (Perl command) to happen before every debugger prompt.
A multi-line command may be entered by backwhacking the newlines.
.IP "> ?" 12
.IX Xref "debugger command, >"
List out post-prompt Perl command actions.
.IP "> command" 12
.IX Xref "debugger command, >"
.IX Item "> command"
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 have guessed this by now).
.IP "> *" 12
.IX Xref "debugger command, >"
Delete all post-prompt Perl command actions.
.IP ">> command" 12
.IX Xref "debugger command, >>"
.IX Item ">> command"
Adds 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.
.IP "{ ?" 12
.IX Xref "debugger command, {"
List out pre-prompt debugger commands.
.IP "{ [ command ]" 12
.IX Item "{ [ command ]"
Set an action (debugger command) to happen before every debugger prompt.
A multi-line command may be entered in the customary fashion.
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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 \f(CW\*(C`;{ ... }\*(C'\fR or even
\&\f(CW\*(C`do { ... }\*(C'\fR.
.IP "{ *" 12
.IX Xref "debugger command, {"
Delete all pre-prompt debugger commands.
.IP "{{ command" 12
.IX Xref "debugger command, {{"
.IX Item "{{ command"
Add an action (debugger command) to happen before every debugger prompt.
A multi-line command may be entered, if you can guess how: see above.
.IP "! number" 12
.IX Xref "debugger command, !"
.IX Item "! number"
Redo a previous command (defaults to the previous command).
.IP "! \-number" 12
.IX Xref "debugger command, !"
.IX Item "! -number"
Redo number'th previous command.
.IP "! pattern" 12
.IX Xref "debugger command, !"
.IX Item "! pattern"
Redo last command that started with pattern.
See \f(CW\*(C`o recallCommand\*(C'\fR, too.
.IP "!! cmd" 12
.IX Xref "debugger command, !!"
.IX Item "!! cmd"
Run cmd in a subprocess (reads from \s-1DB::IN\s0, writes to \s-1DB::OUT\s0) See
\&\f(CW\*(C`o shellBang\*(C'\fR, also.  Note that the user's current shell (well,
their \f(CW$ENV{SHELL}\fR variable) will be used, which can interfere
with proper interpretation of exit status or signal and coredump
information.
.IP "source file" 12
.IX Xref "debugger command, source"
.IX Item "source file"
Read and execute debugger commands from \fIfile\fR.
\&\fIfile\fR may itself contain \f(CW\*(C`source\*(C'\fR commands.
.IP "H \-number" 12
.IX Xref "debugger command, H"
.IX Item "H -number"
Display last n commands.  Only commands longer than one character are
listed.  If \fInumber\fR is omitted, list them all.
.IP "q or ^D" 12
.IX Xref "debugger command, q debugger command, ^D"
.IX Item "q or ^D"
Quit.  (\*(L"quit\*(R" doesn't work for this, unless you've made an alias)
This is the only supported way to exit the debugger, though typing
\&\f(CW\*(C`exit\*(C'\fR twice might work.
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Set the \f(CW\*(C`inhibit_exit\*(C'\fR option to 0 if you want to be able to step
off the end the script.  You may also need to set \f(CW$finished\fR to 0
if you want to step through global destruction.
.IP "R" 12
.IX Xref "debugger command, R"
.IX Item "R"
Restart the debugger by \f(CW\*(C`exec()\*(C'\fRing a new session.  We try to maintain
your history across this, but internal settings and command-line options
may be lost.
.Sp
The following setting are currently preserved: history, breakpoints,
actions, debugger options, and the Perl command-line
options \fB\-w\fR, \fB\-I\fR, and \fB\-e\fR.
.IP "|dbcmd" 12
.IX Xref "debugger command, |"
.IX Item "|dbcmd"