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From: Daniel Berger on 13 Apr 2010 18:56


On Apr 13, 11:26 am, Tony Arcieri <tony.arci...(a)medioh.com> wrote:
> Another option, utilizing Ruby's mutable strings:
>
> while line = io.gets
>   line.slice!(0, 2)
>   io1.write line
> end

If you want to avoid temporary files:

# Backup your file first, just in case, for testing purposes.

require 'mmap'
m = Mmap.new('mtp.txt', 'rw')
m.gsub!(/^..(.*)/, '\1')
m.each{ |line| puts line }
m.unmap

Regards,

Dan

From: Albert Schlef on 13 Apr 2010 21:06
Robert Klemme wrote:
> At your favorite shell prompt:
>
> $ cut -c 3- /home/pt/test/mtp.txt >| /home/pt/test/mtpback.txt

Where is ">|" explained? Looks useful. I did "man bash", and I can find
about three mentions of ">|" there, but it's not explained.


(BTW, removing columns can be done in Vim too, it has a "visual block"
mode, which can be entered with Control-v.)
--
Posted via http://www.ruby-forum.com/.

From: Seebs on 13 Apr 2010 21:06
On 2010-04-14, Albert Schlef <albertschlef(a)gmail.com> wrote:
> Robert Klemme wrote:
>> At your favorite shell prompt:
>>
>> $ cut -c 3- /home/pt/test/mtp.txt >| /home/pt/test/mtpback.txt

> Where is ">|" explained? Looks useful. I did "man bash", and I can find
> about three mentions of ">|" there, but it's not explained.

If the redirection operator is >, and the noclobber
option to the set builtin has been enabled, the redirection
will fail if the file whose name results from the expansion
of word exists and is a regular file. If the redirection
operator is >|, or the redirection operator is > and the
noclobber option to the set builtin command is not enabled,
the redirection is attempted even if the file named by
word exists.

-s
--
Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nospam(a)seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
From: Robert Klemme on 14 Apr 2010 01:37
On 14.04.2010 03:06, Albert Schlef wrote:
> Robert Klemme wrote:
>> At your favorite shell prompt:
>>
>> $ cut -c 3- /home/pt/test/mtp.txt>| /home/pt/test/mtpback.txt
>
> Where is ">|" explained? Looks useful. I did "man bash", and I can find
> about three mentions of ">|" there, but it's not explained.

This is even part of the POSIX standard. I don't have the link handy
and I believe you must register with them but reading and downloading
the standard is free.

> (BTW, removing columns can be done in Vim too, it has a "visual block"
> mode, which can be entered with Control-v.)

Cool, thanks for the hint! In vi(m) I would probably have used
":%s/^..//". :-)

Kind regards

robert

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
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