I have two files, I want to swap the contents of the files in my
program, suggestions?
···
--
Posted via http://www.ruby-forum.com/.
Renaming with a third temp file name is the most efficient if you know
that no file handles are open on these files.
robert
···
2006/12/14, Christopher Latif <christopherl@bredband.net>:
I have two files, I want to swap the contents of the files in my
program, suggestions?
--
Have a look: http://www.flickr.com/photos/fussel-foto/
Christopher Latif wrote:
I have two files, I want to swap the contents of the files in my
program, suggestions?
Why not just rename the files? Or am I missing your meaning?
Tom
Christopher Latif wrote:
I have two files, I want to swap the contents of the files in my
program, suggestions?
I arrived late, here's my untested solution:
sa,sb, nevermind = ARGV
da = File.read(sa)
db = File.read(sb)
File.open(sa,"w") { |f| f.write db }
File.open(sb,"w") { |f| f.write da }
Should work for all but the biggest files.
···
--
Paul Lutus
http://www.arachnoid.com
Robert Klemme wrote:
···
2006/12/14, Christopher Latif <christopherl@bredband.net>:
I have two files, I want to swap the contents of the files in my
program, suggestions?Renaming with a third temp file name is the most efficient if you know
that no file handles are open on these files.robert
How the code for that program going to look like?
--
Posted via http://www.ruby-forum.com/\.
Got to see this topic just now. I do agree with Tom's opinion.
Shiwei
Tom Werner wrote:
···
Christopher Latif wrote:
I have two files, I want to swap the contents of the files in my
program, suggestions?Why not just rename the files? Or am I missing your meaning?
Tom
How abt:
require 'fileutils'
FileUtils.copy_file("a.exe","b.exe")
FileUtils.mv "a.exe.stackdump","a.exe"
FileUtils.mv "b.exe","a.exe.stackdump"
···
On 12/14/06, Christopher Latif <christopherl@bredband.net> wrote:
Robert Klemme wrote:
> 2006/12/14, Christopher Latif <christopherl@bredband.net>:
>> I have two files, I want to swap the contents of the files in my
>> program, suggestions?
>
> Renaming with a third temp file name is the most efficient if you know
> that no file handles are open on these files.
>
> robertHow the code for that program going to look like?
--
gnufied
-----------
There was only one Road; that it was like a great river: its springs
were at every doorstep, and every path was its tributary.
harp:~ > cat a.rb
require 'tempfile'
require 'fileutils'
def swap a, b
fu, f = FileUtils, File
tmpdir = f.dirname b
t = Tempfile.new f.basename(b), f.dirname(b)
t.close
c = t.path
fu.mv b, c
fu.mv a, b
fu.mv c, a
end
a, b, ignored = ARGV
swap a, b
harp:~ > cat a
a
harp:~ > cat b
b
harp:~ > ruby a.rb a b
harp:~ > cat a
b
harp:~ > cat b
a
-a
···
On Thu, 14 Dec 2006, Christopher Latif wrote:
Robert Klemme wrote:
2006/12/14, Christopher Latif <christopherl@bredband.net>:
I have two files, I want to swap the contents of the files in my
program, suggestions?Renaming with a third temp file name is the most efficient if you know
that no file handles are open on these files.robert
How the code for that program going to look like?
--
if you find yourself slandering anybody, first imagine that your mouth is
filled with excrement. it will break you of the habit quickly enough. - the
dalai lama
Shiwei Zhang wrote:
Got to see this topic just now. I do agree with Tom's opinion.
Shiwei
···
--
Posted via http://www.ruby-forum.com/\.
Hi --
···
On Fri, 15 Dec 2006, ara.t.howard@noaa.gov wrote:
a, b, ignored = ARGV
You can also do:
a, b = *ARGV
(which I know you know but it's just another option for anyone who
doesn't want the extra variable 
David
--
Q. What's a good holiday present for the serious Rails developer?
A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black\)
aka The Ruby book for Rails developers!
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)
Hemant Kumar wrote:
How the code for that program going to look like?
How abt:
require 'fileutils'FileUtils.copy_file("a.exe","b.exe")
FileUtils.mv "a.exe.stackdump","a.exe"
FileUtils.mv "b.exe","a.exe.stackdump"
I can't get your code to work, got a error message:
/usr/local/lib/ruby/1.8/fileutils.rb:501:in `rename': No such file or
directory - a.stackdump or a (Errno::ENOENT)
from /usr/local/lib/ruby/1.8/fileutils.rb:501:in `mv'
from /usr/local/lib/ruby/1.8/fileutils.rb:1379:in
`fu_each_src_dest'
from /usr/local/lib/ruby/1.8/fileutils.rb:1395:in
`fu_each_src_dest0'
from /usr/local/lib/ruby/1.8/fileutils.rb:1377:in
`fu_each_src_dest'
from /usr/local/lib/ruby/1.8/fileutils.rb:490:in `mv'
from test.rb:4
···
On 12/14/06, Christopher Latif <christopherl@bredband.net> wrote:
--
Posted via http://www.ruby-forum.com/\.
quite right. i've moved to the former because it's self doccumenting : a
crutch for my feeble mind and almost complete lack of doccumentation skills!
-a
···
On Fri, 15 Dec 2006 dblack@wobblini.net wrote:
Hi --
On Fri, 15 Dec 2006, ara.t.howard@noaa.gov wrote:
a, b, ignored = ARGV
You can also do:
a, b = *ARGV
(which I know you know but it's just another option for anyone who
doesn't want the extra variable
--
if you find yourself slandering anybody, first imagine that your mouth is
filled with excrement. it will break you of the habit quickly enough. - the
dalai lama
Christopher Latif wrote:
Hemant Kumar wrote:
How the code for that program going to look like?
How abt:
require 'fileutils'FileUtils.copy_file("a.exe","b.exe")
FileUtils.mv "a.exe.stackdump","a.exe"
FileUtils.mv "b.exe","a.exe.stackdump"
what's stackdump?
···
On 12/14/06, Christopher Latif <christopherl@bredband.net> wrote:
--
Posted via http://www.ruby-forum.com/\.
I usually use
a,b, = *ARGV
Kind of to be sure...
robert
···
On 14.12.2006 16:23, ara.t.howard@noaa.gov wrote:
On Fri, 15 Dec 2006 dblack@wobblini.net wrote:
Hi --
On Fri, 15 Dec 2006, ara.t.howard@noaa.gov wrote:
a, b, ignored = ARGV
You can also do:
a, b = *ARGV
(which I know you know but it's just another option for anyone who
doesn't want the extra variablequite right. i've moved to the former because it's self doccumenting : a
crutch for my feeble mind and almost complete lack of doccumentation skills!
Hi --
···
On Fri, 15 Dec 2006, ara.t.howard@noaa.gov wrote:
On Fri, 15 Dec 2006 dblack@wobblini.net wrote:
Hi --
On Fri, 15 Dec 2006, ara.t.howard@noaa.gov wrote:
a, b, ignored = ARGV
You can also do:
a, b = *ARGV
(which I know you know but it's just another option for anyone who
doesn't want the extra variablequite right. i've moved to the former because it's self doccumenting : a
crutch for my feeble mind and almost complete lack of doccumentation skills!
Come to think of it... you can do:
a, b = ARGV
I'm not sure why the star presented itself to my brain.
David
--
Q. What's a good holiday present for the serious Rails developer?
A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black\)
aka The Ruby book for Rails developers!
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)
Heh.. don't worry abt stackdump its the stackdump file of of a.exe,
with whom I am going to swap the content. b.exe was the temporary
file. I would suggest go for Ara's solution, I jumped the gun a tad
too quickly.
but, before running mine script, please put your actual file names...
in stead of dummy one that I have put for you. Obviously, in your
current directory those files are not there and hence the error:
require 'fileutils'
FileUtils.copy_file("src_file","temp_file")
FileUtils.mv "dest_file","src_file"
FileUtils.mv "temp_file","dest_file"
but if you are planning to use, above code, you will have to make sure
that your program doesn't have another temp_file open with same name.
···
On 12/14/06, Christopher Latif <christopherl@bredband.net> wrote:
Christopher Latif wrote:
> Hemant Kumar wrote:
>> On 12/14/06, Christopher Latif <christopherl@bredband.net> wrote:
>>> How the code for that program going to look like?
>>>
>>
>> How abt:
>> require 'fileutils'
>>
>> FileUtils.copy_file("a.exe","b.exe")
>> FileUtils.mv "a.exe.stackdump","a.exe"
>> FileUtils.mv "b.exe","a.exe.stackdump"
>what's stackdump?
--
gnufied
-----------
There was only one Road; that it was like a great river: its springs
were at every doorstep, and every path was its tributary.
Yuck.
James Edward Gray II
···
On Dec 14, 2006, at 9:50 AM, Robert Klemme wrote:
I usually use
a,b, = *ARGV