bug diff command

PANEL <[email protected]> Sat, 03 Jan 2015 23:02:52 +0100
Newsgroups gmane.comp.gnu.utils.bugs
Message-ID <1420322572.22209.6.camel@panel-laptop>
"diff -q"  seems recursively search files in subdirectories
"diff -qr" corrects this behavior curiously.

exemples with 2 directories containing same files :

panel@panel-laptop:~$ diff
-q  /media/WORK/topocad/ /media/BACKUPWORK/topocad/
Les sous-répertoires /media/WORK/topocad/doc
et /media/BACKUPWORK/topocad/doc sont identiques.
Les sous-répertoires /media/WORK/topocad/dxf
et /media/BACKUPWORK/topocad/dxf sont identiques.
Les sous-répertoires /media/WORK/topocad/hlp
et /media/BACKUPWORK/topocad/hlp sont identiques.
Les sous-répertoires /media/WORK/topocad/temp
et /media/BACKUPWORK/topocad/temp sont identiques.
panel@panel-laptop:~$ diff
-qr  /media/WORK/topocad/ /media/BACKUPWORK/topocad/
panel@panel-laptop:~$