How to execute files or commands in ruby?

ruby-talk
1

Hi!
This is mi first message i'm new and i'm spanish if you are spanish please
contact me.

My question is:

How I can execute files or commands in the system?

Thanks for reading and have a nice day!

2

Overkill I know

***BEGIN SCRIPT***

class Example
  def hostname
    puts `hostname`
  end
  
  def date
    puts `date`
  end
  
  def message
    puts `echo 'just put you command between the tick marks'`
  end
end

e = Example.new
e.hostname
e.date
e.message

***END SCRIPT***

···

-----Original Message-----
From: F3leR F3leR [mailto:f3ler0x69@gmail.com]
Sent: Wednesday, September 10, 2008 1:51 PM
To: ruby-talk ML
Subject: How to execute files or commands in ruby?

Hi!
This is mi first message i'm new and i'm spanish if you are spanish
please
contact me.

My question is:

How I can execute files or commands in the system?

Thanks for reading and have a nice day!
"NOTICE: This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message."

3

My favorite way of executing commands is
output=%x{command name}

So if you wanted the output of sar to slice and dice your machine's stats

sar_output=%x{sar}

ls_output=%x{ls} is equivalent to ls_output=`ls`, it's just easier to
read/notice in the file etc.

There are other ways of course, but they're more complex, and %x{}
should work for %90 of what you want to do

--kyle

4

I use popen3 because I usually want to capture any output to stderr as
well as stdout. Here is an example:

Open3.popen3("commandname") do |input_stream, output_stream,
error_stream|
  standard_output = output_stream.read
  standard_error = error_stream.read
end

The variables "standard_output" and "standard_error" will be string
variables at that point, containing the text of the error and output
streams. I haven't had a need to use stdin, but I suspect calling the
'write' method on "input_stream" would be be the equivalent of piping
information to the command. However, it may also provide a method of
scripting an interactive command.

You can also use it without a block like this:

[input_stream, output_stream, error_stream] =
Open3.popen3("commandname")

You then have an array containing the IO streams, and then you could
call the 'read' method on the streams just as above, although I've
always used the block form.

James

···

--
Posted via http://www.ruby-forum.com/.

5

That don't work for me.
Only print in the screen the command.

But I found the solution:

exec 'the command'

Have a nice day :wink:

···

2008/9/10 Vazquez, Eduardo <EVazquez@chartone.com>

Overkill I know

***BEGIN SCRIPT***

class Example
def hostname
   puts `hostname`
end

def date
   puts `date`
end

def message
   puts `echo 'just put you command between the tick marks'`
end
end

e = Example.new
e.hostname
e.date
e.message

***END SCRIPT***

-----Original Message-----
From: F3leR F3leR [mailto:f3ler0x69@gmail.com]
Sent: Wednesday, September 10, 2008 1:51 PM
To: ruby-talk ML
Subject: How to execute files or commands in ruby?

Hi!
This is mi first message i'm new and i'm spanish if you are spanish
please
contact me.

My question is:

How I can execute files or commands in the system?

Thanks for reading and have a nice day!
"NOTICE: This email message is for the sole use of the intended
recipient(s) and may contain confidential and privileged information. Any
unauthorized review, use, disclosure or distribution is prohibited. If you
are not the intended recipient, please contact the sender by reply email and
destroy all copies of the original message."

--
Angel Alonso

F3leR

6

You can also use:

returned_data = `df`` # This will execute the command, *df* and the
output of the command will be found on variable *returned_data*

Regards...

···

On Wed, Sep 10, 2008 at 2:27 PM, Angel Alonso <f3ler0x69@gmail.com> wrote:

2008/9/10 Vazquez, Eduardo <EVazquez@chartone.com>

> Overkill I know
>
> ***BEGIN SCRIPT***
>
> class Example
> def hostname
> puts `hostname`
> end
>
> def date
> puts `date`
> end
>
> def message
> puts `echo 'just put you command between the tick marks'`
> end
> end
>
> e = Example.new
> e.hostname
> e.date
> e.message
>
> ***END SCRIPT***
>
>
>
> -----Original Message-----
> From: F3leR F3leR [mailto:f3ler0x69@gmail.com]
> Sent: Wednesday, September 10, 2008 1:51 PM
> To: ruby-talk ML
> Subject: How to execute files or commands in ruby?
>
> Hi!
> This is mi first message i'm new and i'm spanish if you are spanish
> please
> contact me.
>
> My question is:
>
> How I can execute files or commands in the system?
>
> Thanks for reading and have a nice day!
> "NOTICE: This email message is for the sole use of the intended
> recipient(s) and may contain confidential and privileged information.
Any
> unauthorized review, use, disclosure or distribution is prohibited. If
you
> are not the intended recipient, please contact the sender by reply email
and
> destroy all copies of the original message."
>
>
That don't work for me.
Only print in the screen the command.

But I found the solution:

exec 'the command'

Have a nice day :wink:

--
Angel Alonso

F3leR

7

You can also use:

returned_data = `df`` # This will execute the

···

On Wed, Sep 10, 2008 at 2:27 PM, Angel Alonso <f3ler0x69@gmail.com> wrote:

2008/9/10 Vazquez, Eduardo <EVazquez@chartone.com>

> Overkill I know
>
> ***BEGIN SCRIPT***
>
> class Example
> def hostname
> puts `hostname`
> end
>
> def date
> puts `date`
> end
>
> def message
> puts `echo 'just put you command between the tick marks'`
> end
> end
>
> e = Example.new
> e.hostname
> e.date
> e.message
>
> ***END SCRIPT***
>
>
>
> -----Original Message-----
> From: F3leR F3leR [mailto:f3ler0x69@gmail.com]
> Sent: Wednesday, September 10, 2008 1:51 PM
> To: ruby-talk ML
> Subject: How to execute files or commands in ruby?
>
> Hi!
> This is mi first message i'm new and i'm spanish if you are spanish
> please
> contact me.
>
> My question is:
>
> How I can execute files or commands in the system?
>
> Thanks for reading and have a nice day!
> "NOTICE: This email message is for the sole use of the intended
> recipient(s) and may contain confidential and privileged information.
Any
> unauthorized review, use, disclosure or distribution is prohibited. If
you
> are not the intended recipient, please contact the sender by reply email
and
> destroy all copies of the original message."
>
>
That don't work for me.
Only print in the screen the command.

But I found the solution:

exec 'the command'

Have a nice day :wink:

--
Angel Alonso

F3leR

8

That sounds like you're using standard quotes (' or ").
You need to use 'backticks' (`).

···

On Wed, Sep 10, 2008 at 7:27 PM, Angel Alonso <f3ler0x69@gmail.com> wrote:

That don't work for me.
Only print in the screen the command.

--
Rasputnik :: Jack of All Trades - Master of Nuns
http://number9.hellooperator.net/

9

Dick Davies wrote:

···

On Wed, Sep 10, 2008 at 7:27 PM, Angel Alonso <f3ler0x69@gmail.com> > wrote:

That don't work for me.
Only print in the screen the command.

That sounds like you're using standard quotes (' or ").
You need to use 'backticks' (`).

In windows, I always use system("cmd") because the backticks(`) doesn't
work most of the time.
--
Posted via http://www.ruby-forum.com/\.