doc: explain why dd is called "dd"

* doc/coreutils.texi (dd invocation): Mention JCL.

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 7f8c0d194d29f7959a08e94e6c6c0c1e1c733f40..70e7ca09cdbb044f1995c97bc0485ea2ff3da7f6 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -8045,7 +8045,9 @@ dd @var{option}
 @end example
 
 The only options are @option{--help} and @option{--version}.
-@xref{Common options}.  @command{dd} accepts the following operands.
+@xref{Common options}.  @command{dd} accepts the following operands,
+whose syntax was inspired by the DD (data definition) statement of
+OS/360 JCL.
 
 @table @samp