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I have the following hypothetical script that requires arguments to run.
The command line execution looks like this:

'ruby distance_traveled.rb 60 2.5'

The output would be the following:

'You have traveled a distance of 150 miles.'


How would I run the above execution from inside another script, and
capture the output above (the 150 miles portion at least)?

Thanks in advance!
--
Posted via http://www.ruby-forum.com/.

On Dec 29, 2009, at 7:11 PM, John Smith wrote:

> I have the following hypothetical script that requires arguments to =
run.
> The command line execution looks like this:
>=20
> 'ruby distance_traveled.rb 60 2.5'
>=20
> The output would be the following:
>=20
> 'You have traveled a distance of 150 miles.'
>=20
>=20
> How would I run the above execution from inside another script, and
> capture the output above (the 150 miles portion at least)?
>=20
> Thanks in advance!
> --=20
> Posted via http://www.ruby-forum.com/.
>=20


I've faced an exactly same problem when was testing command line =
utilities, by capturing an output and comparing it with expected one. =
Here is a gem for it:

http://github.com/fkocherga/cmd_line_test=20

You may look on running and capturing code there.=20

--
Fedor Kocherga
http://sidenotes.kocherga.info/

On Dec 29, 2009, at 8:11 PM, John Smith wrote:

> I have the following hypothetical script that requires arguments to =
run.
> The command line execution looks like this:
>=20
> 'ruby distance_traveled.rb 60 2.5'
>=20
> The output would be the following:
>=20
> 'You have traveled a distance of 150 miles.'
>=20
>=20
> How would I run the above execution from inside another script, and
> capture the output above (the 150 miles portion at least)?


output =3D `ruby distance_traveled.rb 60 2.5`

The backticks cause the standard output of the command to be captured =
and stored in a Ruby string.


Gary Wright

Gary Wright wrote:
> On Dec 29, 2009, at 8:11 PM, John Smith wrote:
>
>> How would I run the above execution from inside another script, and
>> capture the output above (the 150 miles portion at least)?
>
>
> output = `ruby distance_traveled.rb 60 2.5`
>
> The backticks cause the standard output of the command to be captured
> and stored in a Ruby string.
>
>
> Gary Wright

Thanks so much for that!

One more quick question. If distance_traveled.rb sits in a different
directory than the current script that's calling it, how would I specify
it? For example, say it is in ~project/lib/distance_traveled.rb

Thanks again!
--
Posted via http://www.ruby-forum.com/.

On 30.12.2009 14:06, John Smith wrote:

> One more quick question. If distance_traveled.rb sits in a different
> directory than the current script that's calling it, how would I specify
> it? For example, say it is in ~project/lib/distance_traveled.rb

output = `ruby ~project/lib/distance_traveled.rb 60 2.5`

Or perform string interpolation, if you don't want to hardcode anything:
path = "~/project/lib/"
script = "script.rb"
args = "my args"

output = `#{path}#{script} #{args}`

<warning type="security implications in accepting user input" />

--
Phillip Gawlowski

On Dec 30, 2009, at 8:06 AM, John Smith wrote:
> One more quick question. If distance_traveled.rb sits in a different=20=

> directory than the current script that's calling it, how would I =
specify=20
> it? For example, say it is in ~project/lib/distance_traveled.rb

The command is parsed by the shell so ~project/lib/distance_traveled.rb =
should work or a relative or absolute path of course.

Gary Wright

Gary Wright wrote:
> On Dec 30, 2009, at 8:06 AM, John Smith wrote:
>> One more quick question. If distance_traveled.rb sits in a different
>> directory than the current script that's calling it, how would I specify
>> it? For example, say it is in ~project/lib/distance_traveled.rb
>
> The command is parsed by the shell so ~project/lib/distance_traveled.rb
> should work or a relative or absolute path of course.
>
> Gary Wright

Thanks for the help!

However, I should also add that in the above example,
distance_traveled.rb requires other .rb files sitting in the same lib
directory.

I have no problem running distance_traveled.rb from inside lib. However,
from another directory, when I try to run the program using relative
path (ie. 'ruby ../../lib/distance_traveled.rb'), I get
"distance_traveled.rb:1:in `require': no such file to load -- ", in
reference to the other .rb file(s) in the lib directory.

Any suggestions for this issue? Thanks again!
--
Posted via http://www.ruby-forum.com/.

On Dec 30, 2009, at 12:24 PM, John Smith wrote:
>=20
> However, I should also add that in the above example,=20
> distance_traveled.rb requires other .rb files sitting in the same lib=20=

> directory.
>=20
> I have no problem running distance_traveled.rb from inside lib. =
However,=20
> from another directory, when I try to run the program using relative=20=

> path (ie. 'ruby ../../lib/distance_traveled.rb'), I get=20
> "distance_traveled.rb:1:in `require': no such file to load -- ", in=20
> reference to the other .rb file(s) in the lib directory.
>=20
> Any suggestions for this issue? Thanks again!

If the files aren't in standard library locations, you'll want to make =
sure that you name them relative to the source file using something =
like:

require File.join(File.expand_path(File.dirname(__FILE__)) , 'otherfile')

This ensures that the require method sees a fully qualified path to =
'otherfile' where 'otherfile' is found relative to the directory =
containing the source file instead of relative to the current working =
directory of the process.


Gary Wright