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====== CRLF ======

CR LF Retorno de carro EOL end of line

https://www.cyberciti.biz/faq/howto-unix-linux-convert-dos-newlines-cr-lf-unix-text-format/

En DOS el final de linea suele ser un Carriage Return (CR) y un Line Feed (LF), mientras que en Unix es tan solo un Line Feed (LF).

===== Comprobar si un archivo tiene CRLF =====

Comando:

  file metabox-class.php | grep ASCII

En caso de que **SI** tenga CRLF la salida será:

  metabox-class.php: PHP script, ASCII text, with CRLF line terminators

En caso de que **NO** tenga CRLF la salida será:

  metabox-class.php: PHP script, ASCII text

===== Reemplazar CRLF por LF =====

1. Instalar paquete:

  sudo aptitude install dos2unix
  
2. Ejecutar:

  dos2unix metabox-class.php
  
3. Comprobar:

  file metabox-class.php | grep ASCII

Salida esperada:

  metabox-class.php: PHP script, ASCII text