From: Rob Biedenharn <Rob@...>
Date: 2008-06-05T10:42:29+09:00
Subject: Re: deleting first line from a file

If that's all you want (and you're not frightened by the command-line  
options):

ruby -i -n -e 'puts $_ if $. > 1' lines.txt

Of if you want to keep the original in lines.txt.orig

ruby -i.orig -n -e 'puts $_ if $. > 1' lines.txt

-Rob

On Jun 4, 2008, at 9:16 PM, Peņa, Botp wrote:

> From: suresh [mailto:suresh.amritapuri@gmail.com]
> # I have a HUGE data file multiple lines of data. I want to delete  
> just
> # the first line from it. How to do it efficiently?
>
> i think you want something fast yet clean ruby solution.
>
> maybe something like,
>
> botp@botp-desktop:~$ cat test.txt
> this line will be deleted
> 2nd line
> 3rd asdfasdf line
> 4th qwerty line
> 5th
> 6th six
> 7th 777777777777
>
> botp@botp-desktop:~$ irb
> irb(main):001:0> File.open("newfile","w") do |fw|
> irb(main):002:1*   File.open("test.txt") do |fr|
> irb(main):003:2*      fr.gets
> irb(main):004:2>      fw.write fr.read
> irb(main):005:2>   end
> irb(main):006:1> end
> => 72
>
> botp@botp-desktop:~$ cat newfile
> 2nd line
> 3rd asdfasdf line
> 4th qwerty line
> 5th
> 6th six
> 7th 777777777777
>
>
> just add some checks/rescues so that it will work on all your cases.
>
> kind regards -botp
>

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com