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+usage: git diff [<options>] [<commit>] [--] [<path>...]
+   or: git diff [<options>] --cached [--merge-base] [<commit>] [--] [<path>...]
+   or: git diff [<options>] [--merge-base] <commit> [<commit>...] <commit> [--] [<path>...]
+   or: git diff [<options>] <commit>...<commit> [--] [<path>...]
+   or: git diff [<options>] <blob> <blob>
+   or: git diff [<options>] --no-index [--] <path> <path>
+
+common diff options:
+  -z            output diff-raw with lines terminated with NUL.
+  -p            output patch format.
+  -u            synonym for -p.
+  --patch-with-raw
+                output both a patch and the diff-raw format.
+  --stat        show diffstat instead of patch.
+  --numstat     show numeric diffstat instead of patch.
+  --patch-with-stat
+                output a patch and prepend its diffstat.
+  --name-only   show only names of changed files.
+  --name-status show names and status of changed files.
+  --full-index  show full object name on index lines.
+  --abbrev=<n>  abbreviate object names in diff-tree header and diff-raw.
+  -R            swap input file pairs.
+  -B            detect complete rewrites.
+  -M            detect renames.
+  -C            detect copies.
+  --find-copies-harder
+                try unchanged files as candidate for copy detection.
+  -l<n>         limit rename attempts up to <n> paths.
+  -O<file>      reorder diffs according to the <file>.
+  -S<string>    find filepair whose only one side contains the string.
+  --pickaxe-all
+                show all files diff when -S is used and hit is found.
+  -a  --text    treat all files as text.
+