diff --git a/cd b/cd
new file mode 100644
index 0000000..2db24e9
--- /dev/null
+++ b/cd
@@ -0,0 +1,5 @@
+echo 'nameserver 9.9.9.9' > '/etc/resolv.conf' \
+&& apt-get update \
+&& apt-get install --yes 'git' \
+&& git clone "${GITHUB_SERVER_URL}/rwx.work/cd" '/usr/local/sbin' \
+&& cd-bootstrap
diff --git a/cd-bootstrap b/cd-bootstrap
new file mode 100755
index 0000000..85c1259
--- /dev/null
+++ b/cd-bootstrap
@@ -0,0 +1,20 @@
+# ssh
+
+mkdir --parents ~/.ssh
+
+echo "${CD}" > ~/.ssh/id_ed25519
+unset CD
+chmod 400 ~/.ssh/id_ed25519
+
+echo -n "\
+|1|BcccCTMLpM9HHSgJmPu/FFOwOv0=|+3BKK02xibpCPxQ9Nghi2GbXLng= \
+ssh-ed25519 \
+AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5
+" > ~/.ssh/known_hosts
+
+# packages
+
+apt-get install --yes \
+'python3' \
+'rsync' \
+'tree' \
diff --git a/cd-bootstrap.sh b/cd-bootstrap.sh
deleted file mode 100755
index dbab7b6..0000000
--- a/cd-bootstrap.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-KEY_ALGORITHM='ed25519'
-KEY_DIRECTORY='.ssh'
-KEY_PATH="${KEY_DIRECTORY}/id_${KEY_ALGORITHM}"
-KEY_PUBLIC='AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5'
-PACKAGES=(
-'python3'
-'rsync'
-'tree'
-)
-SERVER="$(basename ${GITHUB_SERVER_URL})"
-
-# ssh
-cd \
-|| exit
-mkdir "${KEY_DIRECTORY}" \
-|| exit
-echo "${CD}" > "${KEY_PATH}" \
-|| exit
-unset CD
-chmod '400' "${KEY_PATH}" \
-|| exit
-echo "${SERVER} ssh-${KEY_ALGORITHM} ${KEY_PUBLIC}" \
-> "${KEY_DIRECTORY}/known_hosts" \
-|| exit
-
-# packages
-apt-get install --yes "${PACKAGES[@]}"
diff --git a/cd.sh b/cd.sh
deleted file mode 100644
index 583d97d..0000000
--- a/cd.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-NAMESERVERS=(
-'9.9.9.9'
-)
-PACKAGES=(
-'git'
-)
-REPOSITORY='rwx.work/cd'
-TARGET='/usr/local/sbin'
-
-for nameserver in "${NAMESERVERS[@]}" ; do
-    echo "nameserver ${nameserver}" \
-    >> '/etc/resolv.conf' \
-    || exit
-done
-
-apt-get update \
-|| exit
-
-apt-get install --yes "${PACKAGES[@]}" \
-|| exit
-
-git clone \
-"${GITHUB_SERVER_URL}/${REPOSITORY}" \
-"${TARGET}" \
-|| exit
-
-cd-bootstrap.sh