diff --git a/chap5-6.sh b/chap5-6.sh
index 30d9482..1a49186 100644
--- a/chap5-6.sh
+++ b/chap5-6.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source ~/.bashrc
 
 source vars.sh
diff --git a/chap7p1.sh b/chap7p1.sh
index 783b5d6..20cc5d5 100644
--- a/chap7p1.sh
+++ b/chap7p1.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source vars.sh
 
 mkdir -pv /{boot,home,mnt,opt,srv}
diff --git a/chap7p2.sh b/chap7p2.sh
index 266e220..6f365ea 100644
--- a/chap7p2.sh
+++ b/chap7p2.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source vars.sh
 
 touch /var/log/{btmp,lastlog,faillog,wtmp}
diff --git a/chap8p1.sh b/chap8p1.sh
index 0412775..e0fc6ad 100644
--- a/chap8p1.sh
+++ b/chap8p1.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source vars.sh
 
 CURRENT_DATE_TIME=$(date +"%Y-%m-%d %T")
diff --git a/chap8p2.sh b/chap8p2.sh
index e756bcf..a274d44 100644
--- a/chap8p2.sh
+++ b/chap8p2.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 source vars.sh
 
 CURRENT_DATE_TIME=$(date +"%Y-%m-%d %T")