diff --git a/cd-bootstrap.sh b/cd-bootstrap.sh
index a6045ad..85c1259 100755
--- a/cd-bootstrap.sh
+++ b/cd-bootstrap.sh
@@ -1,28 +1,20 @@
-KEY_ALGORITHM='ed25519'
-KEY_PATH=".ssh/id_ed25519"
-KEY_PUBLIC='AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5'
-PACKAGES=(
-'python3'
-'rsync'
-'tree'
-)
-SERVER="$(basename ${GITHUB_SERVER_URL})"
-
 # ssh
 
-mkdir '.ssh' \
-|| exit
+mkdir --parents ~/.ssh
 
-echo "${CD}" > "${KEY_PATH}" \
-|| exit
+echo "${CD}" > ~/.ssh/id_ed25519
 unset CD
-chmod '400' "${KEY_PATH}" \
-|| exit
+chmod 400 ~/.ssh/id_ed25519
 
-echo "${SERVER} ssh-${KEY_ALGORITHM} ${KEY_PUBLIC}" \
-> '.ssh/known_hosts' \
-|| exit
+echo -n "\
+|1|BcccCTMLpM9HHSgJmPu/FFOwOv0=|+3BKK02xibpCPxQ9Nghi2GbXLng= \
+ssh-ed25519 \
+AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5
+" > ~/.ssh/known_hosts
 
 # packages
 
-apt-get install --yes "${PACKAGES[@]}"
+apt-get install --yes \
+'python3' \
+'rsync' \
+'tree' \
diff --git a/cd.sh b/cd.sh
index 583d97d..020f5fe 100644
--- a/cd.sh
+++ b/cd.sh
@@ -1,27 +1,15 @@
-NAMESERVERS=(
-'9.9.9.9'
-)
-PACKAGES=(
-'git'
-)
-REPOSITORY='rwx.work/cd'
-TARGET='/usr/local/sbin'
-
-for nameserver in "${NAMESERVERS[@]}" ; do
-    echo "nameserver ${nameserver}" \
-    >> '/etc/resolv.conf' \
-    || exit
-done
-
+echo "\
+nameserver 9.9.9.9
+" > '/etc/resolv.conf' \
+&& \
 apt-get update \
-|| exit
-
-apt-get install --yes "${PACKAGES[@]}" \
-|| exit
-
+&& \
+apt-get install \
+'git' \
+--yes \
+&& \
 git clone \
-"${GITHUB_SERVER_URL}/${REPOSITORY}" \
-"${TARGET}" \
-|| exit
-
+"${GITHUB_SERVER_URL}/rwx.work/cd" \
+'/usr/local/sbin' \
+&& \
 cd-bootstrap.sh