doc: clarify in dd man page that bs= overrides [io]bs=

* src/dd.c (usage): Add the extra info.
Reported in https://bugs.debian.org/859021

diff --git a/src/dd.c b/src/dd.c
index 3638a0a28ce11625fe982e86914e8355d22867af..8ab1efaec2842e3b1fcd773135c67d69990de3c9 100644 (file)
--- a/src/dd.c
+++ b/src/dd.c
@@ -560,7 +560,8 @@ Usage: %s [OPERAND]...\n\
       fputs (_("\
 Copy a file, converting and formatting according to the operands.\n\
 \n\
-  bs=BYTES        read and write up to BYTES bytes at a time\n\
+  bs=BYTES        read and write up to BYTES bytes at a time (default: 512);\n\
+                  overrides ibs and obs\n\
   cbs=BYTES       convert BYTES bytes at a time\n\
   conv=CONVS      convert the file as per the comma separated symbol list\n\
   count=N         copy only N input blocks\n\