Help - Linux?

Ruby
1

Would somebody please try this on Linux for me. It works fine on
Windows but hangs on Fedora.

Thanks,

#!/usr/bin/ruby

require ‘net/ftp’

def getMetar(id)
metar = Array.new
i = 0
ftp = Net::FTP.new(‘tgftp.nws.noaa.gov’)
puts ftp.login
puts ftp.sendcmd(‘PASV’)
ftp.chdir(‘/data/observations/metar/stations’)
ftp.gettextfile(“#{id.upcase}.TXT”) do |line|
metar[i] = line
i = i + 1
end
ftp.close
return metar
end

puts getMetar(“KBFL”)

–

Knute Johnson
email s/nospam/knute/

2

getMetar(“KBFL”)
230 Login successful.
227 Entering Passive Mode (140,90,128,71,21,205)
=> [“2008/02/21 03:54”, “KBFL 210354Z 00000KT 10SM CLR 09/06 A3005 RMK
AO2
SLP176 T00890061”]

Works for me! :slight_smile:

Arlen

3

Arlen C. wrote:

Arlen

Thanks very much, any ideas why it doesn’t for me?

–

Knute Johnson
email s/nospam/knute/

4

Not a clue, I’m afraid. You’ll need to dig deeper into what’s happening
on
the network, probably.

Cheers,
Arlen

5

Knute Johnson wrote:

Works for me! :slight_smile:

Arlen

Thanks very much, any ideas why it doesn’t for me?

Step one: install a command line FTP client. I use “lftp”, but there are
others. Then type

lftp tgftp.nws.noaa.gov
lftp tgftp.nws.noaa.gov:~>

If you don’t get that prompt, there’s something disconnected between
your client and the server. You’ll need to talk to your network
adminstrator to diagnose what’s broken.

But if you do get the prompt, the network is working but the Ruby
client isn’t. There’s probably something wrong with your Ruby
installation. Reinstall Ruby. Try again

6

On Wed, Feb 20, 2008 at 10:24 PM, Knute Johnson
[email protected] wrote:

Would somebody please try this on Linux for me. It works fine on
Windows but hangs on Fedora.

I ran this script:

true && (
set -x
cat /etc/issue.net
ruby -v
cat ftp.rb
./ftp.rb
) >& output.txt

Here’s the content of output.txt:

$ cat output.txt

  • cat /etc/issue.net
    Ubuntu 7.10
  • ruby -v
    ruby 1.8.6 (2007-06-07 patchlevel 36) [i486-linux]
  • cat ftp.rb
    #!/usr/bin/ruby

require ‘net/ftp’

def getMetar(id)
metar = Array.new
i = 0
ftp = Net::FTP.new(‘tgftp.nws.noaa.gov’)
puts ftp.login
puts ftp.sendcmd(‘PASV’)
ftp.chdir(‘/data/observations/metar/stations’)
ftp.gettextfile(“#{id.upcase}.TXT”) do |line|
metar[i] = line
i = i + 1
end
ftp.close
return metar
end

puts getMetar(“KBFL”)

  • ./ftp.rb
    230 Login successful.
    227 Entering Passive Mode (140,90,128,71,211,81)
    2008/02/21 04:54
    KBFL 210454Z 00000KT 10SM CLR 08/06 A3006 RMK AO2 SLP179 T00830061

Regards,

  • Robert
7

M. Edward (Ed) Borasky wrote:

your client and the server. You’ll need to talk to your network
adminstrator to diagnose what’s broken.

But if you do get the prompt, the network is working but the Ruby
client isn’t. There’s probably something wrong with your Ruby
installation. Reinstall Ruby. Try again

The command line client works just fine. I removed and reinstalled ruby
and the problem still exists. Is there some library I have to install
too for the FTP class?

–

Knute Johnson
email s/nospam/knute/

8

On Thu, Feb 21, 2008 at 7:59 AM, Knute Johnson
[email protected] wrote:

Robert C. wrote:

On Wed, Feb 20, 2008 at 10:24 PM, Knute Johnson
[email protected] wrote:

Would somebody please try this on Linux for me. It works fine on
Windows but hangs on Fedora.

You might want to “gem install ruby-debug”, put this at the top of your
program:

require ‘ruby-debug’
Debugger.start
debugger #start irb

…and then use “s” to step through each line and see exactly
where the hang-up is. Might be a threading issue.

Les

9

Robert C. wrote:

ruby -v
ruby 1.8.6 (2007-06-07 patchlevel 36) [i486-linux]
puts ftp.sendcmd(‘PASV’)

  • ./ftp.rb
    230 Login successful.
    227 Entering Passive Mode (140,90,128,71,211,81)
    2008/02/21 04:54
    KBFL 210454Z 00000KT 10SM CLR 08/06 A3006 RMK AO2 SLP179 T00830061

Regards,

  • Robert

OK, so it’s not a Linux problem it’s my Linux problem.

–

Knute Johnson
email s/nospam/knute/

10

Leslie V. wrote:

require ‘ruby-debug’
Debugger.start
debugger #start irb

…and then use “s” to step through each line and see exactly
where the hang-up is. Might be a threading issue.

Les

Les:

I tried this but get the following error

metar.rb:6:in `require’: no such file to load – ruby-debug (LoadError)
from metar.rb:6

There is no ruby-debug package that I can find for Fedora. I tried
loading rubygems.noarch but that didn’t help. There has to be something
simple I’m missing here, I just don’t know what it is.

Thanks,

–

Knute Johnson
email s/nospam/knute/

11

You might want to “gem install ruby-debug”, put this at the
top of your
program:

require ‘rubygems’