====== Delete Empty Files ======

  * Delete Empty Files in a Directoryand subd

   find . -type f -empty -print -delete  # find . -size 0 -delete

  *  Non-Recursive Deletion of Empty Files

    find . -maxdepth 1 -type f -empty -print -delete

  * directory

   find . -type d -empty -print -delete
   
====== Casse variable ======

   name='jean luc est grand'
   echo ${name^^} # ${name^} uniquement la 1ere lettre
      JEAN LUC EST GRAND