What's wrong with these?

ruby-talk
1

Version: ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]
Is there something wrong with this version?

1:
Dir.foreach("/tmp") {|f| puts f if File.directory?(f) }
-- it just prints '.' and '..'

2:
puts Dir.tmpdir
Dir.mktmpdir { |i| puts i }
-- it says 'undefined method'

···

--
Posted via http://www.ruby-forum.com/.

2

Humphrey Alba wrote:

Version: ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]
Is there something wrong with this version?

1:
Dir.foreach("/tmp") {|f| puts f if File.directory?(f) }
-- it just prints '.' and '..'
  
Have you checked to see if you do have directories inside /tmp other than '.' and '..'?
2:
puts Dir.tmpdir
Dir.mktmpdir { |i| puts i }
-- it says 'undefined

As for "undefined method" you're quite right, I can't find Dir#tmpdir defined anywhere either, and yet it's in the docs...what's the deal guys?

···

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3

Humphrey Alba wrote:

Dir.foreach("/tmp") {|f| puts f if File.directory?(f) }
-- it just prints '.' and '..'

Dir.foreach("/tmp") {|f| puts f if File.directory?("/tmp/#{f}") }
or
Dir.chdir("/tmp") do
  Dir.foreach(".") {|f| puts f if File.directory?(f) }
end
or
Dir.glob("/tmp/*") {|f| puts f if File.directory?(f) }
or
Dir.glob("/tmp/*/") {|f| puts f}
or
puts Dir.glob("/tmp/*/")
or
puts Dir["/tmp/*/"]

The glob-ones will not include hidden directories or . and .. and they will
print the full-path to the dir (though you could also use chdir with glob, if
you don't want the full path).

HTH,
Sebastian

4

Version: ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]
Is there something wrong with this version?

1:
Dir.foreach("/tmp") {|f| puts f if File.directory?(f) }
-- it just prints '.' and '..'

This is because of what Dir.foreach returns:

http://www.ruby-doc.org/core/classes/Dir.html#M002327

Hint: paths are missing.

2:
puts Dir.tmpdir
Dir.mktmpdir { |i| puts i }
-- it says 'undefined method'

Well, what do you conclude from that?

Kind regards

  robert

···

On 06.04.2009 03:39, Humphrey Alba wrote:

5

Hi,

At Mon, 6 Apr 2009 11:03:09 +0900,
Michael Malone wrote in [ruby-talk:333071]:

> 2:
> puts Dir.tmpdir
> Dir.mktmpdir { |i| puts i }
> -- it says 'undefined
As for "undefined method" you're quite right, I can't find Dir#tmpdir
defined anywhere either, and yet it's in the docs...what's the deal guys?

require 'tmpdir'

···

--
Nobu Nakada

6

Michael Malone wrote:

Humphrey Alba wrote:

Version: ruby 1.9.1p0 (2009-01-30 revision 21907) [i686-linux]
Is there something wrong with this version?

1:
Dir.foreach("/tmp") {|f| puts f if File.directory?(f) }
-- it just prints '.' and '..'
  
Have you checked to see if you do have directories inside /tmp other
than '.' and '..'?

Yes, there are directories inside /tmp

···

--
Posted via http://www.ruby-forum.com/\.

7

Nobuyoshi Nakada wrote:

Hi,

At Mon, 6 Apr 2009 11:03:09 +0900,
Michael Malone wrote in [ruby-talk:333071]:

> 2:
> puts Dir.tmpdir
> Dir.mktmpdir { |i| puts i }
> -- it says 'undefined
As for "undefined method" you're quite right, I can't find Dir#tmpdir
defined anywhere either, and yet it's in the docs...what's the deal guys?

require 'tmpdir'

Thanks.

···

--
Posted via http://www.ruby-forum.com/\.

8

Yeah. The core rdoc on http://www.ruby-doc.org/ has a pitfall that it
includes the standard libraries as well. (Nobody separated out the
standard libraries from that.)

If you want to know what's in the core, getting a copy of PickAxe is a
better bet.

--Ken

···

On Sun, 05 Apr 2009 21:19:04 -0500, Nobuyoshi Nakada wrote:

Hi,

At Mon, 6 Apr 2009 11:03:09 +0900,
Michael Malone wrote in [ruby-talk:333071]:

> 2:
> puts Dir.tmpdir
> Dir.mktmpdir { |i| puts i }
> -- it says 'undefined
As for "undefined method" you're quite right, I can't find Dir#tmpdir
defined anywhere either, and yet it's in the docs...what's the deal
guys?

require 'tmpdir'

--
Chanoch (Ken) Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/