Writing to a file without opening it

ruby-talk
1

File.open(file, 'a+') won't work when the file is not readable.

However, in a shell I can append a string using
  echo string >> file

Am I forced to use exec + echo to append content, or is there a way to
append a string to a file using ruby code.. without opening the file?

2

harp:~ > rm file

   harp:~ > touch file

   harp:~ > chmod 200 file

   harp:~ > strace sh -c 'echo string >> file' 2>&1|grep open|tail -1
   open("file", O_WRONLY|O_APPEND|O_CREAT|O_LARGEFILE, 0666) = 3

   harp:~ > ruby -e' open("file", File::WRONLY|File::APPEND|File::CREAT, 0666){|f| f.puts "string2"} '

   harp:~ > chmod 600 file

   harp:~ > cat file
   string
   string2

-a

···

On Tue, 6 Jun 2006, Sy Ali wrote:

File.open(file, 'a+') won't work when the file is not readable.

However, in a shell I can append a string using
echo string >> file

Am I forced to use exec + echo to append content, or is there a way to
append a string to a file using ruby code.. without opening the file?

--
suffering increases your inner strength. also, the wishing for suffering
makes the suffering disappear.
- h.h. the 14th dali lama

3

File.open(file, 'a+') won't work when the file is not readable.

However, in a shell I can append a string using
echo string >> file

Am I forced to use exec + echo to append content, or is there a way to
append a string to a file using ruby code.. without opening the file?

Use mode 'a' instead of 'a+' in File.open

Yoann

4

That worked like a charm, thanks!

···

On 6/6/06, Yoann Guillot <john-rubytalk@ofjj.net> wrote:

Use mode 'a' instead of 'a+' in File.open

5

Just a quick thanks.. this pointed me in the right direction for some
of the more advanced uses of 'open'. It'll come in handy. =)

···

On 6/5/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:

   harp:~ > ruby -e' open("file", File::WRONLY|File::APPEND|File::CREAT, 0666){|f| f.puts "string2"} '