From: Shashank Date <sdate@...>
Date: 2003-07-12T22:01:59+09:00
Subject: Re: Getting my IP address


"daz" <dooby@d10.karoo.co.uk> wrote in message
> C:\WINDOWS>ruby -rsocket -e'puts IPSocket.getaddress(Socket.gethostname)'
>
> ... gives nothing / no error msg.
>
> C:\WINDOWS>ruby -rsocket -e 'puts IPSocket.getaddress(Socket.gethostname)'
> 213.249.173.103
>
> Difference: a space after -e

Yes, I stumbled on it too. One more thing one should be aware of: the single
quote
around the ruby script does not always work. In that case use double quote.
Like:

  C:\>ruby -ve '1.times{|i| puts i}'
  ruby 1.8.0 (2003-06-23) [i386-mswin32]
  -e:1: unterminated string meets end of file
  'i' is not recognized as an internal or external command,
  operable program or batch file.

  C:\>ruby -e "1.times{|i| puts i}"
  0

Apparently if single quotes are used, DOS does not escape the special
characters
in this case the pipe '|'  symbol before 'i'. But everything is fine within
the double quotes.
This is on WIN XP Pro.

> Space after -r is optional, apparently.

Yes.

> I'll go and produce my "language stress graph" for this week ;)

I bet there are only three points of stress ;)  (read the section "Dangerous
Ruby"
Pages [25,26] of Ruby Developer's Guide for more details).

> daz

-- shanko

> ruby -rwavy -e 'puts Wavy.line(rand(80), rand(6), ".")'
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
What ?