From: Gennady Bystritsky <Gennady.Bystritsky@...>
Date: 2010-04-13T23:39:25+09:00
Subject: Re: how to delete the first two characters  of each row?


On Apr 13, 2010, at 4:17 AM, Pen Ttt wrote:

> how to delete the first two characters  of each row?
> i want to delete the first two characters  of each row in file
> /home/pt/test/mtp.txt
> 
> 
> io=open("/home/pt/test/mtp.txt","r")
> io1=open("/home/pt/test/mtpback.txt","w")
> while line=io.gets
>   ioput=line.delete("/^..../")

As Brian has mentioned, String#delete in your code is instructed to remove the actual string starting with character '/', not a regular expression, as you might have meant. Also, most likely you want to exclude end-of-lines from counting.

Another problem is that your files remain open, so you need to close them at some point. I think you need something like this:

File.open("/home/pt/test/mtpback.txt", "w") { |output|
  File.open("/home/pt/test/mtp.txt", "r") { |input|
    input.each { |line|
      output.puts line.chomp[2..-1].to_s
    }
  }
}

Gennady.