How to execute Windows CLI commands in Ruby?

Question

I have a file located in the directory "C:\Documents and Settings\test.exe" but when I write the command `C:\Documents and Settings\test.exe in single qoutes(which I am not able to display in this box), used for executing the commands in Ruby, I am not able to do so and the error that I recieve is No file or Directory found. I have tried replacing "\" with "//" and "\" but nothing seems to work. I have also used system, IO.popen and exec commands but all efforts are in vain. Also exec commands makes the program to make an exit which I don't want to happen.

Thanks in advance.

I'm assuming you bean "backtick" instead of "single quotes", but I'm not going to edit your question unless you confirm that. — davetron5000
– davetron5000, Commented Aug 25, 2011 at 12:30

David Sulc · Accepted Answer · 2015-10-30 09:04:17Z

8

The backtick environment is like double-quotes, so backslash are used for escaping. Further, Ruby will interpret the spaces as separating command-line arguments, so you need to quote the entire thing:

`"C:\\Documents and Settings\\test.exe"`

Another option is to use system and force a second argument. If system gets more than one argument, it treats the first argument as the path to the command to execute and you don't need to quote the command:

system('C:\Documents and Settings\test.exe','')

Note the use of single quotes, so we don't have escape the backslashes.

Of course, this won't get you the standard out/error, so if you are on Ruby 1.9.2, you can use the awesomely handy Open3 library, which works like system, but gives you more information about the process you just ran:

require 'open3'

stdout,stderr,status = Open3.capture3('C:\Documents and Settings\test.exe','')

puts stdout # => string containing standard output of your command
puts stderr # => string containing standard ERROR of your command
if status.success?
  puts "It worked!"
else
  puts "OH NOES! Got exit code #{status.exitstatus}"
end

edited Oct 30, 2015 at 9:04

David Sulc

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answered Aug 25, 2011 at 12:29

davetron5000

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1 Comment

stack1 Over a year ago

undefined method `capture3' for Open3:Module (NoMethodError) with ruby 1.8.7

fl00r · Accepted Answer · 2011-04-03 18:24:36Z

6

`"C:\Documents and Settings\test.exe"`

or

`exec "C:\Documents and Settings\test.exe"`

or whatever in qoutes

answered Apr 3, 2011 at 18:24

fl00r

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2 Comments

fl00r Over a year ago

main idea is to wrap the path into quotes. I am not familiar with Windows so there can be any other restrictions.

Apoorv Saxena Over a year ago

Don't know if the file I am working with has some constraints to work in a Ruby program or the way I am specifying the path of the file is incorrect but the thing is not working for me... But the method that you have told is correct!!!

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