Forum: Ruby append new line to textfile

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Mmcolli00 M. (Guest)
on 2008-11-21 23:45
I want to create a text file and append a new line to the text file
everytime a new logline is completed, my program iterates and gives a
new log every few hours.

this is an example of my logline:
logline: 'completed' starttime 04:00 endtime 23:00

my goal is to have a text file populated with the following
'completed' starttime 04:00 endtime 22:00
'completed' starttime 06:00 endtime 01:00
'completed' starttime 05:00 endtime 23:00
'completed' starttime 09:00 endtime 23:00

so far this is my method...yes, I am a beginner. Thanks in advance. MC

File.open('logfile.txt')do |f1|
f1.logline
end
Shane E. (Guest)
on 2008-11-22 00:03
(Received via mailing list)
On Fri, Nov 21, 2008 at 4:41 PM, Mmcolli00 Mom
<removed_email_address@domain.invalid>wrote:

> 'completed' starttime 05:00 endtime 23:00
>
File.open('logfile.txt', 'w+') do |f1|  f1.write(logline)
end
Siep K. (Guest)
on 2008-11-22 00:27
Shane E. wrote:
> On Fri, Nov 21, 2008 at 4:41 PM, Mmcolli00 Mom
> <removed_email_address@domain.invalid>wrote:
>
>> 'completed' starttime 05:00 endtime 23:00
>>
> File.open('logfile.txt', 'w+') do |f1|  f1.write(logline)
> end
This will destroy the content of logfile.txt. For appending to a file
instead of overwriting it, use "a"

3.times do |n|
  logline = "logline #{n}"
  File.open('D:/temp/logfile1.txt', 'w+') do |f1|
    f1.puts(logline)
  end
  File.open('D:/temp/logfile2.txt', 'a') do |f1|
    f1.puts(logline)
  end
end

hth,

Siep
Rob B. (Guest)
on 2008-11-22 00:28
(Received via mailing list)
On Nov 21, 2008, at 4:58 PM, Shane E. wrote:
>> 'completed' starttime 04:00 endtime 22:00
>>
> File.open('logfile.txt', 'w+') do |f1|  f1.write(logline)
> end
> --
> Shane E.


Eek! No, that's for a read/write file.  You want a mode of 'a' for
append.  All write operations will first reposition to the end-of-file.

-Rob

Rob B.    http://agileconsultingllc.com
removed_email_address@domain.invalid
Shane E. (Guest)
on 2008-11-22 00:37
(Received via mailing list)
On Fri, Nov 21, 2008 at 5:23 PM, Siep K.
<removed_email_address@domain.invalid>wrote:

>
> hth,
>
> Siep
> --
> Posted via http://www.ruby-forum.com/.
>
>
whoops, sorry about that.
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