From: "Douglas A. Seifert" <doug@...>
Date: 2008-07-17T22:42:37+09:00
Subject: Re: Help with array

Victor Reyes wrote:
> Hello team,
>
> I am having an issue with the code below.
> Could you please take a quick look at the highlighted and commented code
> below and let me know what's wrong?
>
> Thank you
>
> Victor
>
>
> input.file
> group.was=hostname1 hostname.2 hostname.r3
> group.web=webserver1 webserver2 webserver3 hostname1 /usr/local/bin/test.sh
> web /usr/local/bin/testcmd.sh
> #end of input.file
>
> # Program
> @myhostname = `hostname` # webserver3
> #comment# The intent is to create a arrays "was" and "web" and to assign the
> values in the group statement
> IO.foreach("inpit.file") do |line|
>   if line =~ /^#/ || line.chomp.length == 0
>     next
>   end # if line
>   if line.upcase =~ /^GROUP/
>     grouplit, groupinfo = line.split(".")
>     groupname, groupentries = groupinfo.split("=")
>     #{groupname} = groupname.to_a
>     groupname = groupentries.split
>     next
>   end  # if GROUP
>   targetserver, command = line.split(" ")
>   if targetserver == @myhostname
>       @runcommand = true
>   end # if targetserver
> #comment# In this case I'm trying to determine if "myhostname" is in the
> array "web"
> #comment# I've tried a number of ways to get the following to work without
> success
>   if #{targetserver}.*include?* "#{@myhostname <%23%7B@myhostname>}"
> ####### THIS IS WHERE THE FAILURE IS
>     @runcommand = true
>   end # if
> end
> exit
>
>   
Victor,

In ruby, a statement like

#{foo} = 'bar'

just won't work.  You are trying to use "dynamic variables" (ala PHP I 
guess) and that simply does not work in ruby.  Here is a version of your 
code that I think does what you are trying to do.  I removed the @ 
sigils on the variable names ... you might need to add them back if you 
took this code out of a class you are working on.  I also stored the 
group arrays in a ruby Hash object keyed by the group name.  There are 
other ways to do this, the best one depends on your specific needs.  You 
also had what looked to be a misspelling in the IO.foreach statement: 
your version was opening 'inpit.file' not 'input.file'.

# Program
#@myhostname = `hostname` # webserver3
myhostname = 'webserver3'
runcommand = false
command_to_run = nil
#comment# The intent is to create a arrays "was" and "web" and to assign 
the values in the group statement
groups = {}
IO.foreach("input.file") do |line|
  if line =~ /^#/ || line.chomp.length == 0
    next
  end # if line
  if line.upcase =~ /^GROUP/
    grouplit, groupinfo = line.split(".")
    groupname, groupentries = groupinfo.split("=")
    groups[groupname] = groupentries.split
    next
  end  # if GROUP
  targetserver, command_to_run = line.split(" ")
  if targetserver == myhostname
      runcommand = true
  end # if targetserver
#comment# In this case I'm trying to determine if "myhostname" is in the 
array "web"
#comment# I've tried a number of ways to get the following to work 
without success
end

if groups['web'].include?(myhostname)
####### THIS IS WHERE THE FAILURE IS
  runcommand = true
end
puts "groups: #{groups.inspect}"
puts "run command: #{runcommand}, command: #{command_to_run}"
exit