diff --git a/sheets/hd b/sheets/hd
new file mode 100644
index 0000000..83cf9f1
--- /dev/null
+++ b/sheets/hd
@@ -0,0 +1,2 @@
+# show hex dump of 20 bytes of /etc/passwd (skip 10 first bytes)
+hd -s 10 -n 20 /etc/passwd