$ sort --version
sort (GNU coreutils) 6.10
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Mike Haertel and Paul Eggert.
Apres une lecture du man, je n'ai pas trouvé le moyen de trier inplace
un fichier.
Auriez-vous une piste?