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-rw-r--r--doc/coreutils.texi5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index c8ba53c78..6714ada86 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -3939,6 +3939,11 @@ multiple fields.
Example: To sort on the second field, use @option{--key=2,2}
(@option{-k 2,2}). See below for more notes on keys and more examples.
+See also the @option{--debug} option to help determine the part
+of the line being used in the sort.
+
+@item --debug
+Highlight the portion of each line used for sorting.
@item --batch-size=@var{nmerge}
@opindex --batch-size