Question

假设我有一个非常简单的Ruby程序：

require 'rubygems'
require 'ruby-debug'
x = 1
debugger
puts x

当执行命中'debugger'命令时，它会正常停止并给我'rdb'提示符。

现在：我的目标是让程序打印2而不是1.如何完成此操作？如果我输入'help'，那么rdebug会告诉我：

ruby-debug help v0.10.4
Type 'help <command-name>' for help on a specific command

Available commands:
backtrace  delete   enable  help  method  putl     set     trace    
break      disable  eval    info  next    quit     show    undisplay
catch      display  exit    irb   p       reload   step    up       
condition  down     finish  kill  pp      restart  thread  var      
continue   edit     frame   list  ps      save     tmate   where

'set'命令看起来很有希望......但是：

(rdb:1) help set
Modifies parts of the ruby-debug environment. Boolean values take
on, off, 1 or 0.
You can see these environment settings with the "show" command.

-- 
List of set subcommands:
--  
set annotate -- Set annotation level
set args -- Set argument list to give program being debugged when it is started
set autoeval -- Evaluate every unrecognized command
set autolist -- Execute 'list' command on every breakpoint
set autoirb -- Invoke IRB on every stop
set autoreload -- Reload source code when changed
set basename -- Report file basename only showing file names
set callstyle -- Set how you want call parameters displayed
set debuggertesting -- Used when testing the debugger
set forcestep -- Make sure 'next/step' commands always move to a new line
set fullpath -- Display full file names in frames
set history -- Generic command for setting command history parameters
set keep-frame-bindings -- Save frame binding on each call
set linetrace+ -- Set line execution tracing to show different lines
set linetrace -- Set line execution tracing
set listsize -- Set number of source lines to list by default
set trace -- Display stack trace when 'eval' raises exception
set width -- Number of characters the debugger thinks are in a line

没有骰子。怎么办？

我查看了Official ruby-debug doc并查看了RailsGuides Debugging Rails Applications doc，但没有看到答案。

Answer 1

Mike和noodi的答案都很棒！请注意，迈克的例子中的“完成”是方法或块的结尾（这实际上是程序的结束），而noodi解决方案中的“continue”继续执行。

另请注意，如果“set autoeval”设置为“on”，则会自动评估您在（rdb）提示符处输入的非命令的任何内容。因此，您不需要输入“p x = 1”，而是可以输入“x = 1”而不必进入irb以避免“p”或“eval”。

在较新的打孔系列调试器https://github.com/rocky/rb-trepanning/wiki和https://github.com/rocky/rbx-trepanning/wiki中，默认设置为启用。

Answer 2

您需要使用eval或p，然后finish继续浏览脚本。类似的东西：

(rdb:1) p x=2
2
(rdb:1) finish
2

Answer 3

→ ruby temp.rb 
temp.rb:5
puts x
(rdb:1) irb
ruby-1.9.2-p0 > x
 => 1 
ruby-1.9.2-p0 > x = 2
 => 2 
ruby-1.9.2-p0 > ^D
temp.rb:5
puts x
(rdb:1) cont
2

如何在Ruby调试器中设置变量（ruby-debug / rdebug）？

3 个答案: