My Unix Ruby program needs to write a file that will be read by
SqlServer running on Windows. I need for the lines I write to this
file to end in \r\n
, the DOS/Windows line ending, rather than \n
,
the Unix line ending. I want this to happen without me having to
manually add the \r to the end of each line.
The starting point
If my program writes to the file like this:
File.open("/tmp/foo", "w") do |file|
file.puts "stuff"
end
Then the file has Unix line endings:
$ od -c foo
0000000 s t u f f \n
That is expected, since my program is running on Unix. But I
need for this file (and this file only) to have DOS line endings.
Adding the \r to each line manually
If I add the \r to each line manually:
File.open("/tmp/foo", "w") do |file|
file.puts "stuff\r"
end
Then the file has DOS line endings:
$ od -c /tmp/foo
0000000 s t u f f \r \n
This works, but has to be repeated for each line I want to write.
Using String#encode
As shown by this SO answer, I can modify the string using
String#encode before writing it:
File.open("/tmp/foo", "w") do |file|
file.puts "alpha\nbeta\n".encode(crlf_newline: true)
end
This results in DOS line endings:
$ od -c /tmp/foo
0000000 a l p h a \r \n b e t a \r \n
This has the advantage that if I am writing multiple lines at once,
one call to #encode will change all the line endings for that one
write. However, it's verbose, and I still have to specify the line
ending for every write.
How can I cause each puts
to an open file in Unix to end
the line in the Windows \r\n
line ending rather than the Unix '\n'
line ending?
I am running Ruby 2.3.1.
Copyright Notice:Content Author:「Wayne Conrad」,Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article:https://stackoverflow.com/questions/37121061/how-to-write-dos-line-endings-to-a-file-from-unix