Operation modes:

-h

(ignored)

-v, --verbose

report a few statistics on stderr

--help

display this help then exit

--version

display program version then exit

Formatting output:

-T, --initial-tab

produce TAB instead of initial space

-l, --paginate

paginate output through `pr'

-S, --string[=STRING]

take note of another user STRING

-V, --show-links

give file and line references in annotations

-t, --expand-tabs

expand tabs to spaces in the output

Debugging:

-0, --debugging

output many details about what is going on

Word mode options:

-1, --no-deleted

inhibit output of deleted words

-2, --no-inserted

inhibit output of inserted words

-3, --no-common

inhibit output of common words

-A, --auto-pager

automatically calls a pager

-k, --less-mode

variation of printer mode for "less"

-m, --avoid-wraps

do not extend fields through newlines

-o, --printer

overstrike as for printers

-z, --terminal

use termcap as for terminal displays

-O, --item-regexp=REGEXP

compare items as defined by REGEXP

-W, --word-mode

compare words instead of lines

With no FILE, or when FILE is -, read standard input.