From 8f21c4f0cb0a9bbb70c69394d004de6effbcc61c Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Fri, 29 Jun 2018 10:47:35 +0100
Subject: [PATCH] fops: sh -x is fun

---
 README.adoc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.adoc b/README.adoc
index c6597ce..79a91dd 100644
--- a/README.adoc
+++ b/README.adoc
@@ -3010,6 +3010,14 @@ Sources:
 * link:kernel_module/fops.c[]
 * link:rootfs_overlay/fops.sh[]
 
+Then give this a try:
+
+....
+sh -x /fops.sh
+....
+
+We have put printks on each fop, so this allows you to see which system calls are being made for each command.
+
 File operations is the main method of userland driver communication.
 
 `struct file_operations` determines what the kernel will do on filesystem system calls of <<pseudo-filesystems>>.