blocks|key|995018|text|在Ruby中有几种运行系统命令的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|995019|irb(main):003:0>+`date+/t`+#+surround+with+backticks
=>+"Thu+07/01/2010+\n"
irb(main):004:0>+system("date+/t")+#+system+command+(returns+true/false)
Thu+07/01/2010
=>+true
irb(main):005:0>+%25x{date+/t}+#+%25x{}+wrapper
=>+"Thu+07/01/2010+\n"|code-block|syntax|javascript|995020|但是，如果需要使用命令的stdin/stdout实际执行输入和输出，则可能需要查看IO::popen方法，该方法专门提供了该功能。|offset|length|style|CODE|995021|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core/classes/IO.html#M002242^0|0|0|15|9|15|9|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

There's a few ways to run system commands in Ruby.

<pre><code>irb(main):003:0&gt; `date /t` # surround with backticks
=&gt; "Thu 07/01/2010 \n"
irb(main):004:0&gt; system("date /t") # system command (returns true/false)
Thu 07/01/2010
=&gt; true
irb(main):005:0&gt; %x{date /t} # %x{} wrapper
=&gt; "Thu 07/01/2010 \n"
</code></pre>

But if you need to actually perform input and output with the command's stdin/stdout, you'll probably want to look at the <a href="http://ruby-doc.org/core/classes/IO.html#M002242" rel="noreferrer"><code>IO::popen</code></a> method, which specifically offers that facility.

blocks|key|1209402|text|是的，这当然是可行的，但实现方法的不同取决于所讨论的“命令行”程序是在“全屏”模式下运行还是在命令行模式下运行。为命令行编写的程序倾向于读取STDIN和写入STDOUT。可以在Ruby中使用标准的反引号方法和/或系统/exec调用直接调用这些函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1209403|如果程序在“全屏”模式下运行，比如screen或vi，那么方法就必须有所不同。对于这样的程序，您应该寻找"expect“库的Ruby实现。这将允许您编写您希望在屏幕上看到的内容，以及当您看到这些特定字符串出现在屏幕上时要发送的内容。|1209404|这不太可能是最好的方法，你可能应该看看你正在尝试实现什么，并找到相关的库/gem来实现这一点，而不是试图自动化现有的全屏应用程序。举个例子，"Need+assistance+with+serial+port+communications+in+Ruby“处理串口通信，如果你想要使用你提到的特定程序来实现拨号，那么它就是一个前置光标。|offset|length|1209405|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/167858/need-assistance-with-serial-port-communications-in-ruby^0|0|0|1Z|1J|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Yes this is certainly doable but the method of implementation differs dependant on whether the "command line" program in question operates in "Full screen" or command line mode. Programs written for the command line tend to read STDIN and write to STDOUT. These can be called directly within Ruby using the standard backticks methods and/or system/exec calls.

If the program operates in "Full Screen" mode like screen or vi then the approach has to be different. For programs like this you should look for a Ruby implementation of the "expect" library. This will allow you to script what you expect to see on screen and what to send when you see those particular strings appear on screen.

This is unlikely to be the best approach and you should probably look at what you are trying to achieve and find the relevant library/gem to do that rather than trying to automate an existing full screen application. As an example "<a href="https://stackoverflow.com/questions/167858/need-assistance-with-serial-port-communications-in-ruby">Need assistance with serial port communications in Ruby</a>" deals with Serial Port communications, a pre-cursor to dialing if that is what you want to achieve using the specific programs you mentioned.

blocks|key|1209412|text|+folder+=+"/"
+list_all_files+=+"ls+-al+#{folder}"
+output+=+`#{list_all_files}`
+puts+output|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1209413|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> folder = "/"
 list_all_files = "ls -al #{folder}"
 output = `#{list_all_files}`
 puts output
</code></pre>

blocks|key|1209460|text|最常用的方法是使用Open3，这里是我的代码编辑版本，上面的代码有一些更正：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1209461|require+'open3'
puts"Enter+the+command+for+execution"
some_command=gets
stdout,stderr,status+=+Open3.capture3(some_command)
STDERR.puts+stderr
if+status.success?
++puts+stdout
else
++STDERR.puts+"ERRRR"
end|code-block|syntax|javascript|1209462|entityMap^0|9|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The Most Used method is Using <code>Open3</code> here is my code edited version of the above code with some corrections: 

<pre><code>require 'open3'
puts"Enter the command for execution"
some_command=gets
stdout,stderr,status = Open3.capture3(some_command)
STDERR.puts stderr
if status.success?
 puts stdout
else
 STDERR.puts "ERRRR"
end
</code></pre>

Is there a way to run command line commands through Ruby? I'm trying to create a small little Ruby program that would dial out and receive/send through command line programs like 'screen', 'rcsz', etc.

It would be great if I could tie all this in with Ruby (MySQL backend, etc.)

Running command line commands within Ruby script

有没有办法通过Ruby运行命令行命令？我正在尝试创建一个小的Ruby程序，它可以拨出并通过命令行程序进行接收/发送，如“screen”、“rcsz”等。如果我能把所有这些都与Ruby (MySQL后端等)结合起来，那就太好了。

问在Ruby脚本中运行命令行命令
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Ruby脚本中运行命令行命令EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Ruby脚本中运行命令行命令
EN