Improved script reliability

how-to-create-encrypted-paper-backup/secure-erase.sh

@@ -1,5 +1,8 @@
 #! /bin/bash
 
+set -e
+set -o pipefail
+
 rounds=3
 
 positional=()
@@ -58,11 +61,11 @@ read -r answer
 if [ "$answer" = "y" ]; then
   for round in $(seq 1 1 $rounds); do
     printf "%s\n" "Overwriting with random data… (round $round of $rounds)"
-    sudo dd bs=1M if=/dev/urandom of=$dev
+    sudo dd bs=1M if=/dev/urandom of=$dev || true
   done
   if [ $zero = true ]; then
     printf "%s\n" "Overwriting with zeros…"
-    sudo dd bs=1M if=/dev/zero of=$dev
+    sudo dd bs=1M if=/dev/zero of=$dev || true
   fi
 else
   exit 0