From: Victor Reyes <victor.reyes@...>
Date: 2008-07-22T04:44:48+09:00
Subject: Re: How to invoke an external program and get anything the pgm returns back

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On Mon, Jul 21, 2008 at 3:24 PM, Sandor Sz=FCcs <sandor.szuecs@fu-berlin.de=
>
wrote:

>
> On 21.07.2008, at 20:35, Victor Reyes wrote:
>
>  I tried:
>> Ruby script segment:
>>      rc =3D `/usr/local/bin/script_name`
>>
>> I also tried in the Ruby caller script:
>>     system("/usr/local/bin/script_name")
>>
>> KSH:
>> exit 99
>>
>
> Ask $? to get the information.
> $?.exitstatus
>
>  But *rc* does not have anything of value. It has either *true* or *false=
*.
>>
>
>
> irb> res =3D `ls file_not_exists`
> ls: file_not_exists: No such file or directory
> =3D> ""
> irb> $?.exitstatus
> =3D> 1
>
> According to ri page Kernel.system also sets $?
>
>
> $ qri Kernel.system
> ---------------------------------------------------------- Kernel#system
>     system(cmd [, arg, ...])    =3D> true or false
> ------------------------------------------------------------------------
>     Executes cmd in a subshell, returning true if the command was
>     found and ran successfully, false otherwise. An error status is
>     available in $?. The arguments are processed in the same way as
>     for Kernel::exec.
>
> hth. regards, Sandor Sz=FCcs
> --
>


Great! It works!
Here is what I have:

/tmp>cat pg1
#!/usr/local/ruby-1.8.6/bin/ruby -W0
puts "Calling /usr/local/bin/test.rb"
system("/usr/local/bin/test.rb")
puts $?.exitstatus
puts "Calling /usr/local/bin/test.ksh"
system("/usr/local/bin/test.ksh")
puts $?.exitstatus
puts "Now exiting"
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
/usr/local/bin>cat test.rb
#!/usr/local/ruby-1.8.6/bin/ruby -W0
puts "This is a Ruby script"
exit 199
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
/usr/local/bin>cat test.ksh
#!/bin/ksh
echo "This is a Korn Shell script"
exit 99
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

And this is the result:

Calling /usr/local/bin/test.rb
This is a Ruby script
199
Calling /usr/local/bin/test.ksh
This is a Korn Shell script
99
Now exiting
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Thank you

Victor

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