doc: group dd conv= options that are actually flags

* src/dd.c (usage): Move 'sync' up with other data transformation
options.  Having it alongside 'fsync' and 'fdatasync' is
particularly confusing.  Also the double line description of
the 'sync' option, serves as a visual break from the "flag"
type options that follow.
* doc/coreutils.texi (dd invocation):  Apply the same grouping
as above, by splitting the "conv=" table in two.

2 files changed, 24 insertions, 20 deletions

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index ea35afe29..9f6c734ca 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -8062,22 +8062,29 @@ Swap every pair of input bytes.  @sc{gnu} @command{dd}, unlike others, works
 when an odd number of bytes are read---the last byte is simply copied
 (since there is nothing to swap it with).
 
-@item noerror
-@opindex noerror
-@cindex read errors, ignoring
-Continue after read errors.
+@item sync
+@opindex sync @r{(padding with @acronym{ASCII} @sc{nul}s)}
+Pad every input block to size of @samp{ibs} with trailing zero bytes.
+When used with @samp{block} or @samp{unblock}, pad with spaces instead of
+zero bytes.
 
-@item nocreat
-@opindex nocreat
-@cindex creating output file, avoiding
-Do not create the output file; the output file must already exist.
+@end table
+
+The following ''conversions'' are really file flags
+and don't effect and internal processing:
 
+@table @samp
 @item excl
 @opindex excl
 @cindex creating output file, requiring
 Fail if the output file already exists; @command{dd} must create the
 output file itself.
 
+@item nocreat
+@opindex nocreat
+@cindex creating output file, avoiding
+Do not create the output file; the output file must already exist.
+
 The @samp{excl} and @samp{nocreat} conversions are mutually exclusive.
 
 @item notrunc
@@ -8085,11 +8092,10 @@ The @samp{excl} and @samp{nocreat} conversions are mutually exclusive.
 @cindex truncating output file, avoiding
 Do not truncate the output file.
 
-@item sync
-@opindex sync @r{(padding with @acronym{ASCII} @sc{nul}s)}
-Pad every input block to size of @samp{ibs} with trailing zero bytes.
-When used with @samp{block} or @samp{unblock}, pad with spaces instead of
-zero bytes.
+@item noerror
+@opindex noerror
+@cindex read errors, ignoring
+Continue after read errors.
 
 @item fdatasync
 @opindex fdatasync
diff --git a/src/dd.c b/src/dd.c
index fd468a647..a2b4d209f 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -499,18 +499,16 @@ Each CONV symbol may be:\n\
   block     pad newline-terminated records with spaces to cbs-size\n\
   unblock   replace trailing spaces in cbs-size records with newline\n\
   lcase     change upper case to lower case\n\
-"), stdout);
-      fputs (_("\
-  nocreat   do not create the output file\n\
-  excl      fail if the output file already exists\n\
-  notrunc   do not truncate the output file\n\
   ucase     change lower case to upper case\n\
   swab      swap every pair of input bytes\n\
+  sync      pad every input block with NULs to ibs-size; when used\n\
+            with block or unblock, pad with spaces rather than NULs\n\
 "), stdout);
       fputs (_("\
+  excl      fail if the output file already exists\n\
+  nocreat   do not create the output file\n\
+  notrunc   do not truncate the output file\n\
   noerror   continue after read errors\n\
-  sync      pad every input block with NULs to ibs-size; when used\n\
-            with block or unblock, pad with spaces rather than NULs\n\
   fdatasync  physically write output file data before finishing\n\
   fsync     likewise, but also write metadata\n\
 "), stdout);