2008/11/21 Raju Alluri <avr_1 / yahoo.com>:
> Hi, I have a script as below. Can you please tell me if something is
> wrong here ?
> It errors out for this code where as if I pass full name instead of
> variable, it is working.
>
> cat readfile5.rb
> #!/usr/bin/env ruby
> logfiledir = "/apollo/env/A9AdamAdProxy/var/output/logs"
> filename = `ls -t #{logfiledir} | grep service_log | head -1`

I suspect that the command returns a string that ends in a
newline character. Try adding:

    filename.chomp!

> fullfilename = logfiledir + "/" + filename
> puts "Full name of the file is #{fullfilename}"

When debugging such stuff, it's always a good
idea to use #inspect for strings:

    puts "Full name of the file is #{fullfilename.inspect}"

> file = File.new("#{fullfilename}", "r")
> data = ''
>   while (line = file.gets)
>        data += line if line =~ /START/ .. line =~ /EOE/
>   end
>   file.close
>
> ERROR:
> readfile5.rb:6:in `initialize': No such file or directory -
> /apollo/env/A9AdamAdProxy/var/output/logs/service_log.2008-11-21-20
> (Errno::ENOENT)
>        from readfile5.rb:6:in `new'
>        from readfile5.rb:6
>
> Thanks,
> Raju

Stefan