diff [-abcdefhilnpqrstuwyBEHNPT ] [-LINES ] [-x PATTERN ] [-C LINES ] [-D NAME ] [-F REGEXP ] [-I REGEXP ] [-L LABEL ] [-S FILE ] [-U LINES ] [-W COLUMNS ] [-X FILE ] [--binary ] [--brief ] [--changed-group-format=fORMAT ] [--context [=LINES ]] [--diff-program=PROGRAM ] [--ed ] [--exclude=PATTERN ] [--exclude-from=FILE ] [--expand-tabs ] [--forward-ed ] [--from-file=FILE ] [--horizon-lines=LINES ]