jython-users

Re: [Jython-users] Problem with command module

[Glen S. <gl...@en...>]

On Tue, 10 Jul 2001, Kevin McNamee wrote:
> Is there no possibility to run arbitrary system commands without writing
> Java code?


In a nutshell, no... however, it is not Java code you will be
writing... it will be Jython :-)

For example:

from java.lang import *
Process p = Runtime.getRuntime().exec("ls -al")
p.waitFor()

Re: [Jython-users] Problem with command module

[Kevin M. <qk...@lm...>]

The solution is a bit more complicated it seems. The following works well.


from java.io import *
from java.lang import *

proc = Runtime.getRuntime().exec("ls -la")
stdin = proc.getInputStream()
isr = InputStreamReader(stdin)
br=BufferedReader(isr)

line = br.readLine()
while line != None :
        print(line)
        line = br.readLine()


I got some help from this resource:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Comments?



On Tue, 10 Jul 2001, D-Man wrote:

> On Tue, Jul 10, 2001 at 03:44:54PM +0200, Kevin McNamee wrote:
> | OK, this works, but it just returns '0'. I guess this the return code from
> | the 'ls -al' command. Where is the actual output?
>
> Yep.  That means that the command completed successfully (at least
> that's the convention on *nix).
>
> See
> http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Process.html.
> java.lang.Runtime.exec returns a java.lang.Process object to you.
> That Process object has methods
>
>     getOutputStream()
>     getInputStream()
>     getErrorStream()
>     exitValue()
>
> You are looking to getOutputStream from the Process.  The waitFor
> method returns the exitValue.
>
> HTH,
> -D
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>

_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

Re: [Jython-users] Problem with command module

[D-Man <ds...@ri...>]

On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
| On Tue, 10 Jul 2001, Kevin McNamee wrote:
| > Is there no possibility to run arbitrary system commands without writing
| > Java code?
| 
| 
| In a nutshell, no... however, it is not Java code you will be
| writing... it will be Jython :-)
| 
| For example:
| 
| from java.lang import *
| Process p = Runtime.getRuntime().exec("ls -al")
  ^^^^^^^

:-)  That is Java.  Jython doesn't use type declarations.

| p.waitFor()

-D

Re: [Jython-users] Problem with command module

[Kevin M. <qk...@lm...>]

OK, this works, but it just returns '0'. I guess this the return code from
the 'ls -al' command. Where is the actual output?


On Tue, 10 Jul 2001, D-Man wrote:

> On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
> | On Tue, 10 Jul 2001, Kevin McNamee wrote:
> | > Is there no possibility to run arbitrary system commands without writing
> | > Java code?
> |
> |
> | In a nutshell, no... however, it is not Java code you will be
> | writing... it will be Jython :-)
> |
> | For example:
> |
> | from java.lang import *
> | Process p = Runtime.getRuntime().exec("ls -al")
>   ^^^^^^^
>
> :-)  That is Java.  Jython doesn't use type declarations.
>
> | p.waitFor()
>
> -D
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>

_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

Re: [Jython-users] Problem with command module

[D-Man <ds...@ri...>]

On Tue, Jul 10, 2001 at 03:44:54PM +0200, Kevin McNamee wrote:
| OK, this works, but it just returns '0'. I guess this the return code from
| the 'ls -al' command. Where is the actual output?

Yep.  That means that the command completed successfully (at least
that's the convention on *nix).

See
http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Process.html.
java.lang.Runtime.exec returns a java.lang.Process object to you.
That Process object has methods

    getOutputStream()
    getInputStream()
    getErrorStream()
    exitValue()

You are looking to getOutputStream from the Process.  The waitFor
method returns the exitValue.

HTH,
-D

Re: [Jython-users] Problem with command module

[Glen S. <gl...@en...>]

On Tue, 10 Jul 2001, D-Man wrote:
> On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
> | On Tue, 10 Jul 2001, Kevin McNamee wrote:
> | > Is there no possibility to run arbitrary system commands without writing
> | > Java code?
> | 
> | 
> | In a nutshell, no... however, it is not Java code you will be
> | writing... it will be Jython :-)
> | 
> | For example:
> | 
> | from java.lang import *
> | Process p = Runtime.getRuntime().exec("ls -al")
>   ^^^^^^^
> 
> :-)  That is Java.  Jython doesn't use type declarations.

My bad... I guess since I am mixing Java classes and Python classes
together so much I tend to get confused from time to time.

 > 
> | p.waitFor()
> 
> -D
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
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