launch external program

[Andrey Demidov]

Hi all,

I'm running external programs like this:

status = `rdesktop .... &`

But my ruby script doesn't work until the external program finished.
How can I run an external program asynchronously?

Thanks.

 

[Christopher Carver]

[Note: parts of this message were removed to make it a legal post.]

system("command")

You cannot save the output, though.

 

[Bertram Scharpf]

Hi,

Am Mittwoch, 17. Jun 2009, 22:22:49 +0900 schrieb Christopher Carver:

system("command")

You cannot save the output, though.

Yes, you can.

output = ""
t = Thread.new { output << `somecmd` }
...
t.alive? or puts "The full output is:", output

Bertram

 

[Robert Klemme]

Am Mittwoch, 17. Jun 2009, 22:22:49 +0900 schrieb Christopher Carver:

Christopher, system does not execute commands asynchronously.

Yes, you can.

Obama?

output = ""
t = Thread.new { output << `somecmd` }
...
t.alive? or puts "The full output is:", output

You can do this as well:

t = Thread.new { `somecmd` }
....
output = t.value

It seems Thread#value is rarely used but it can be of very useful.

http://ruby-doc.org/core-1.8.7/classes/Thread.html#M000243

Kind regards

robert

 

[Joel VanderWerf]

You can do this as well:

t = Thread.new { `somecmd` }
...
output = t.value

Thread#value blocks while the thread is running, though.

 

[Jeff Bowen]

Thread#value blocks while the thread is running, though.

Ok but how would you in Windows start a seperate program like a vendor
software that runs seperate from the ruby program? If I try
`run_me.exe` or
system("run_me.exe") the ruby program just sits waiting for the other to
finsh?

 

[Robert Klemme]

Thread#value blocks while the thread is running, though.

Well, yes. But what is your point? If you want the result you need
to wait anyway. If not you can still use your pattern:

t.alive? or puts "The full output is:", t.value

Kind regards

robert

--=20
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

 

[Bertram Scharpf]

Hi,

Am Donnerstag, 18. Jun 2009, 05:45:08 +0900 schrieb Robert Klemme:

You can do this as well:

t = Thread.new { `somecmd` }
...
output = t.value

Gosh, that's the programming style I was looking for.

Bertram