Logstash file: how to read first line only

[Betorov]

Hi evreyone.
I wanted to know if it's possible to read only the first line of a file and exit (after send information to elastisearch)
Thanks in advance

[Krunal]

pls show your first line...
so that we can see it contain what ?

[Betorov]

Thanks for your reply Kurnal

The first line of my file would be:

ÿØÿà JFIF ÿÛ C a

(it's a binary file you can't read it)

I' not interested in the content itself but in the place where the file is located (path). I want take only the first line and exit because if i read all lines logstash give an encoding error

 Received an event that has a different character encoding than you configured.{:text=>"\\v\\u0011\\f\\r\\f\\r\\f\\u0011\\u001A\\u0010\\u0013\\u0010\\u0010\\u0013\\u0010\\u001A\\u0017\\e\\u0016\\u0015\\u0016\\e\\u0017) \\u001C\\u001C )/'%'/9339GDG]]}\\xFF\\xC2\\u0000\\v\\b\\u0001h\\u0001h\\u0001\\u0001!\\u0000\\xFF\\xC4\\u0000\\u001D\\u0000\\u0001\\u0000\\u0002\\u0002\\u0003\\u0001\\u0001\\u0000\\u0000\\u0000\\u0000\\u0000\\u0000\\u0000\\u0000\\u0000\\u0000\\u0004\\u0005\\u0002\\b\\u0003\\a\\t\\u0006\\u0001\\xFF\\xDA\\u0000\\b\\u0001\\u0001\\u0000\\u0000\\u0000\\u0000\\xDB\\u0002\\xCAK\\u001Ab\\xCAK\\u001Ab\\xCAK\\u001Ab\\xCAK\\u001Ab\\xCAK\\u001Ab\\xCAK\\u001A`YIcLYIcLYIcLYIcLYIcLYIcL\\v),i\\x8B),i\\x8B),i\\x8B),i\\x8B),i\\x8B),i\\x8B\\u0013\\f\\xD8\\xE4a\\x9B\\u001C\\x8C3c\\x91\\x86lr0͎F\\u0019\\xB1ȔWEr\\xDB\\u0015\\xD1\\\\\\xB6\\xC5tW-\\xB1]\\u0015\\xCBlWEr\\xDB\\u0015\\xD1\\\\\\xB6\\xC0\\xAE\\x8A\\xE5\\xB6)\\xFE\\u0005\\xC9j@\\x8A\\xE4\\xB5 ErZ\\xFD5\\xBDtW-\\xB1]\\u0015\\xCBl"
  :expected_charset=>"UTF-8"}

I have tried to change the encoding but it didn't work.

[Krunal]

you can put if condition, if it fulfill then put that lin in msg and afterward you can retrieve data which you want from message or u can use regex...

[Betorov]

Thanks @Krunal for your reply.
You mean to take the first value and get out of the file?

[Krunal]

yes...take value and drop the other data...
it will be easy i think..