blocks|key|1533512|text|把这个放到%25userprofile%25\.irbrc里面，你就很棒了|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1533513|def+cls
++system('cls')
end|code-block|syntax|javascript|1533514|来自IRB+clear+screen+on+windows。|1533515|entityMap|0|LINK|mutability|MUTABLE|url|http://snipplr.com/view/3055/irb-clear-screen-on-windows/^0|5|K|0|0|2|R|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Throw this inside <code>%userprofile%\.irbrc</code> and you're good

<pre><code>def cls
 system('cls')
end
</code></pre>

From <a href="http://snipplr.com/view/3055/irb-clear-screen-on-windows/" rel="noreferrer">IRB clear screen on windows</a>.

blocks|key|1533548|text|在*nix框上|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1533549|`clear`|code-block|syntax|javascript|1533550|在Windows上|1533551|system+'cls'+#+works
`cls`+#+does+not+work|1533552|在OSX上|1533553|system+'clear'+#+works
`clear`+#+does+not+work|1533554|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

On *nix boxes 

<pre><code>`clear`
</code></pre>

on Windows

<pre><code>system 'cls' # works
`cls` # does not work
</code></pre>

on OSX

<pre><code>system 'clear' # works
`clear` # does not work
</code></pre>

blocks|key|1533698|text|在Ubuntu11.10系统上，clear将主要清除irb窗口。您将得到一个打印的返回=>+True值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1533699|一大堆丑陋的文字|1533700|ruby-1.9.2-p290+:007+>+system+'clear'|code-block|syntax|javascript|1533701|你会得到什么：|1533702|+=>+true+
ruby-1.9.2-p290+:007+>+|1533703|entityMap^0|G|5|17|7|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

On Ubuntu 11.10 system <code>clear</code> will mostly clear the irb window. You get a return <code>=&gt; True</code> value printed.

A big mess of ugly text

<pre><code>ruby-1.9.2-p290 :007 &gt; system 'clear'
</code></pre>

what ya get:

<pre><code> =&gt; true 
ruby-1.9.2-p290 :007 &gt; 
</code></pre>

blocks|key|1749118|text|我今天才发现这一点:在Pry+(一种IRB替代方法)中，以.开头的一行输入将被转发到命令外壳。这意味着在Mac和Linux上，我们可以使用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1749119|.+clear|code-block|syntax|javascript|1749120|并且，在Windows+(命令提示符和Windows终端)上，我们可以使用：|1749121|.+cls|1749122|来源：pry.github.io|1749123|entityMap|0|LINK|mutability|MUTABLE|url|https://pry.github.io/^0|T|1|0|0|0|0|3|D|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|Q|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

Just discovered this today: in Pry (an IRB alternative), a line of input that begins with a <code>.</code> will be forwarded to the command shell. Which means on Mac &amp; Linux, we can use:
<pre><code>. clear
</code></pre>
And, on Windows (Command Prompt and Windows Terminal), we can use:
<pre><code>. cls
</code></pre>
Source: <a href="https://pry.github.io" rel="nofollow noreferrer">pry.github.io</a>

blocks|key|1534361|text|system+'clear'|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1534362|应该也适用于Rails4.0|unstyled|1534363|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>system 'clear'
</code></pre>

Should work for rails 4.0 as well

blocks|key|1748716|text|要清除屏幕，只需执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1748717|puts+"\e[H\e[2J"|code-block|syntax|javascript|1748718|附注:这是在Linux上测试的。|1748719|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In order to clear the screen just do:

<pre><code>puts "\e[H\e[2J"
</code></pre>

P.S. This was tested on Linux.

blocks|key|1748784|text|puts+`clear`|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1748785|清除屏幕，然后返回在MacOSX10.6终端和iTerm2上测试过的=>+nil。|unstyled|offset|length|style|CODE|1748786|entityMap^0|0|Y|6|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>puts `clear`
</code></pre>

Clears the screen and then returns <code>=&gt; nil</code> Tested on Mac OSX 10.6 Terminal and iTerm2.

blocks|key|1534393|text|方法：def+clear_screen++++if+RUBY_PLATFORM+=~+/win32%7Cwin64%7C\.NET%7Cwindows%7Ccygwin%7Cmingw32/i+++++++system('cls')+++++else+++++++system('clear')++++end+end|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1534394|或者在IRB中，您可以使用system('clear')|1534395|entityMap^0|3|41|0|D|F|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

blocks|key|1749042|text|在windows中，使用Rails+4，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1749043|system('cls')|code-block|syntax|javascript|1749044|对我很管用|1749045|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In windows, using Rails 4,

<pre><code>system('cls')
</code></pre>

worked for me

blocks|key|1534498|text|这里有很多很好的答案，但我经常从windows远程使用Mintty进入linux机器。上面提到的使用.irbrc是值得称赞的，但我想出了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1534499|def+cls
++puts+"\ec\e[3J"
end

def+clear
++puts+"\e[H\e[2Js"
end|code-block|syntax|javascript|1534500|这为你提供了*nix+'clear‘行为和Windows+'cls’行为的选项，如果我真的想要核化缓冲区而不是仅仅将它滚动出视图，我经常会发现这两个行为更有用。|1534501|另外，一个类似的变体也适用于.bashrc：|1534502|alias+cls='echo+-e+"\ec\e[3J"'|1534503|如果有人能找到一种方法将其映射到击键，我很乐意听到。我真的希望在osx上有一些类似于cmd-k的东西，可以在Mintty中工作。|1534504|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Tons of good answers here, but I often remote into a linux box with Mintty from windows. Kudos to the above about using .irbrc, but came up with this:

<pre><code>def cls
 puts "\ec\e[3J"
end

def clear
 puts "\e[H\e[2Js"
end
</code></pre>

This gives you the options for both the *nix 'clear' behavior and the Windows 'cls' behavior, which I often find more useful if I really want to nuke the buffer rather than just scrolling it out of view.

P.S. a similar variant also works in .bashrc:

<pre><code>alias cls='echo -e "\ec\e[3J"'
</code></pre>

If anyone could find a way to actually map that to a keystroke, I'd love to hear it. I would really like to have something akin to cmd-k on osx that would work in Mintty.

blocks|key|1534231|text|Windows用户只需尝试，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1534232|system+'cls'|code-block|syntax|javascript|1534233|或|1534234|system('cls')|1534235|在IRB窗口中看起来像这样，|1534236|irb(main):333:0>+system+'cls'
irb(main):007:0>+system('cls')|1534237|在ruby+1.9.3中我做到了这一点。但是，以下命令不起作用并返回=>+nil。|offset|length|style|CODE|1534238|system('clear')
system+'clear'
system+`cls`+++++++#using+the+backquotes+below+ESC+Key+in+windows|1534239|entityMap^0|0|0|0|0|0|0|Y|6|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|14|8|@$Q|15|R|16|S|T]]|9|@]|A|$]]|$1|U|3|V|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

Windows users simply try,

<pre><code>system 'cls'
</code></pre>

OR

<pre><code>system('cls')
</code></pre>

Looks like this in the IRB window,

<pre><code>irb(main):333:0&gt; system 'cls'
irb(main):007:0&gt; system('cls')
</code></pre>

Did the trick for me in ruby 1.9.3. However the following commands did not work and returned <code>=&gt; nil</code>,

<pre><code>system('clear')
system 'clear'
system `cls` #using the backquotes below ESC Key in windows
</code></pre>

blocks|key|1534272|text|我在可执行文件中使用了以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1534273|def+clear
++++system("cls")+%7C%7C+system("clear")+%7C%7C+puts("\e[H\e[2J")
end

clear|code-block|syntax|javascript|1534274|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've used this for executable files:

<pre><code>def clear
 system("cls") || system("clear") || puts("\e[H\e[2J")
end

clear
</code></pre>

blocks|key|1534318|text|system+'cls'+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1534319|我在Windows下工作，使用Ruby+2.2.0和rails+4.0|unstyled|1534320|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>system 'cls' 
</code></pre>

Works for me in Windows, with Ruby 2.2.0 and rails 4.0

blocks|key|1534004|text|我来这里是为了寻找一种用irb重置tty的方法，因为它不会打印换行符，也不会显示我输入的内容，而只是一些输出。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1534005|1.9.3-p125+:151+>+++system+'reset'|code-block|syntax|javascript|1534006|终于为我做了这件事！|1534007|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I came here looking for a way to reset the tty with irb, since it wasn't printing newlines or showing what I typed somehow, only some output.

<pre><code>1.9.3-p125 :151 &gt; system 'reset'
</code></pre>

finally did the trick for me!

blocks|key|1533914|text|对于windows用户：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1533915|如果您创建的bat文件名为c.bat，其内容为：|1533916|@echo+off
cls|code-block|syntax|javascript|1533917|然后，在IRB中，你可以说：|1533918|system('c')|1533919|清除控制台。我只是想分享一下，因为我觉得那很酷。基本上，路径中的任何内容都是可访问的。|1533920|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For windows users: 

If you create a bat file name c.bat whose contents are:

<pre><code>@echo off
cls
</code></pre>

Then, in IRB, you can say:

<pre><code>system('c')
</code></pre>

to clear the console. I just thought I would share because I thought that was pretty cool. Essentially anything in the path is accessible.

blocks|key|1534097|text|->(a,b,c){x=a.method(b);a.send(c,b){send+c,b,&x;false};print"\e[2J\e[H+\e[D"}[irb_context,:echo?,:define_singleton_method]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1534098|这将完全清除你的IRB屏幕，没有额外的空行和“=>nil”的东西。已在Linux/Windows上测试。|unstyled|1534099|这一行代码可以扩展为：|1534100|lambda+{
++original_echo+=+irb_context.method(:echo?)
++irb_context.send(:define_singleton_method,+:echo?)+{
++++send+:define_singleton_method,+:echo?,+&original_echo
++++false
++}
++print+"\e[2J\e[H+\e[D"
}.call|1534101|这使用了很多技巧。|1534102|首先，irb将调用echo?来检查是否应该打印结果。我保存了这个方法，然后用一个方法重新定义，这个方法恢复了定义，但返回了false，这样irb就不会回显结果。|offset|length|style|CODE|1534103|其次，我打印了一些ANSI控制字符。\e[2J将清理屏幕，\e[H将光标移动到屏幕的左上角位置。\e[D将打印一个空格，然后向后移动光标，而这是在Windows上解决一些奇怪的问题的方法。|1534104|最后，这是一点都不实用的。只需微笑;)|1534105|entityMap^0|0|0|0|0|0|9|5|0|I|5|T|4|1C|4|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$B|C]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|13|8|@$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@$O|17|P|18|Q|R]|$O|19|P|1A|Q|R]|$O|1B|P|1C|Q|R]]|9|@]|A|$]]|$1|U|3|V|5|F|7|1D|8|@]|9|@]|A|$]]|$1|W|3|-4|5|F|7|1E|8|@]|9|@]|A|$]]]|X|$]]

<pre><code>-&gt;(a,b,c){x=a.method(b);a.send(c,b){send c,b,&amp;x;false};print"\e[2J\e[H \e[D"}[irb_context,:echo?,:define_singleton_method]
</code></pre>

This will fully clear your IRB screen, with no extra empty lines and “=> nil” stuff. Tested on Linux/Windows.

This one-liner could be expanded as:

<pre><code>lambda {
 original_echo = irb_context.method(:echo?)
 irb_context.send(:define_singleton_method, :echo?) {
 send :define_singleton_method, :echo?, &amp;original_echo
 false
 }
 print "\e[2J\e[H \e[D"
}.call
</code></pre>

This uses lots of tricks.

Firstly, irb will call <code>echo?</code> to check if the result should be printed. I saved the method, then redefined with a method which restores the defination but returns false so irb will not echo the result. 

Secondly, I printed some ANSI control chars. <code>\e[2J</code> will clean the screen and <code>\e[H</code> will move the cursor to the upper left position of the screen. <code>\e[D</code> will print a space and then move back the cursor while this is a workaround for something strange on Windows.

Finally this is kind of not practical at all. Just smile ;)

blocks|key|1748579|text|反引号运算符捕获命令的输出并将其返回|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1748580|s+=+`cls`
puts+s|code-block|syntax|javascript|1748581|我想会工作得更好。|1748582|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The backtick operator captures the output of the command and returns it

<pre><code>s = `cls`
puts s
</code></pre>

would work better, I guess.

How do you clear the IRB console screen?

How Do You Clear The IRB Console?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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