From bde421e48d7a25e38fb4a6114bd2a1ca1506ea30 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <xry111@xry111.site>
Date: Sun, 2 Oct 2022 16:12:26 +0800
Subject: [PATCH] reboot: fix /dev/shm unmounting command

/dev/shm may be a mount point, or a symlink.
---
 chapter11/reboot.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chapter11/reboot.xml b/chapter11/reboot.xml
index 1d76fcc7a..809d9bb70 100644
--- a/chapter11/reboot.xml
+++ b/chapter11/reboot.xml
@@ -107,7 +107,7 @@
   <para>Then unmount the virtual file systems:</para>
 
 <screen><userinput>umount -v $LFS/dev/pts
-umount -v $LFS/dev/shm
+mountpoint -q $LFS/dev/shm &amp;&amp; umount $LFS/dev/shm
 umount -v $LFS/dev
 umount -v $LFS/run
 umount -v $LFS/proc