Off topic: running non-ruby programs through command line

Rails
1

Hi all,

Slightly OT, but is there any way to run command-line programs through
Ruby?
I have a rails web application that performs some database work. After a
certain action is performed, the rails app should then call a java
program
that performs additional work to our mainframe. This is under Win 2003
Server.

Any ideas?

Thanks,
Jin L.

2

I think %x{ command } does this

3

On Tue, 2006-08-08 at 10:26 -0700, Jin L. wrote:

Hi all,

Slightly OT, but is there any way to run command-line programs through
Ruby? I have a rails web application that performs some database work.
After a certain action is performed, the rails app should then call a
java program that performs additional work to our mainframe. This is
under Win 2003 Server.

You can probably use

system(…)

see Kernel.system for docs. Or backticks

java -jar whatever.jar

bye
John

4

Hi.
It’s not a good idea, IMHO, to call an external app on a http session.
You will hang your session unless you work with threads / forks.

A good way is:

  • Drop a file on a directory with all parameters you need.
  • Create an robot that reads the directory from time to time and calls
    your java app with parameters is file.
    – Before calling the java app is good to move the dropped file to avoid
    getting the same file several times.

This is ok if you need it asynchronous.

[]'s
Romeu Fonseca

-----Mensagem original-----
De: [email protected]
[mailto:[email protected]] Em nome de Jin L.
Enviada em: terça-feira, 8 de agosto de 2006 13:26
Para: [email protected]
Assunto: [Rails] off topic: running non-ruby programs through command
line

Hi all,

Slightly OT, but is there any way to run command-line programs through
Ruby? I have a rails web application that performs some database work.
After a certain action is performed, the rails app should then call a
java program that performs additional work to our mainframe. This is
under Win 2003 Server.

Any ideas?

Thanks,
Jin L.

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5

2006/8/8, Romeu Henrique Capparelli F. [email protected]:

– Before calling the java app is good to move the dropped file to avoid
getting the same file several times.

another way: use the backgrounDRb plugin. so you can even make cron-like
things, status reporting back to the app, etc