diff --git a/cd-bootstrap.sh b/bootstrap.sh
similarity index 60%
rename from cd-bootstrap.sh
rename to bootstrap.sh
index dbab7b6..054d967 100755
--- a/cd-bootstrap.sh
+++ b/bootstrap.sh
@@ -1,3 +1,7 @@
+FILE="$(realpath "${BASH_SOURCE[0]}")"
+ROOT="$(dirname "${FILE}")"
+
+COMMANDS='cmd'
 KEY_ALGORITHM='ed25519'
 KEY_DIRECTORY='.ssh'
 KEY_PATH="${KEY_DIRECTORY}/id_${KEY_ALGORITHM}"
@@ -8,6 +12,15 @@ PACKAGES=(
 'tree'
 )
 SERVER="$(basename ${GITHUB_SERVER_URL})"
+TARGET='/usr/local/sbin'
+
+# commands
+cd "${ROOT}/${COMMANDS}" \
+|| exit
+for file in *.sh ; do
+    cp "${file}" "${TARGET}/${file%.sh}" \
+    || exit
+done
 
 # ssh
 cd \
@@ -24,4 +37,8 @@ echo "${SERVER} ssh-${KEY_ALGORITHM} ${KEY_PUBLIC}" \
 || exit
 
 # packages
-apt-get install --yes "${PACKAGES[@]}"
+apt-get install --yes "${PACKAGES[@]}" \
+|| exit
+
+# remove
+rm --force --recursive "${ROOT}"
diff --git a/cd-list-environment b/cd-list-environment
deleted file mode 100755
index e22987a..0000000
--- a/cd-list-environment
+++ /dev/null
@@ -1,2 +0,0 @@
-unset TOP_SECRET
-env | sort
diff --git a/cd.sh b/cd.sh
index 583d97d..f04df33 100644
--- a/cd.sh
+++ b/cd.sh
@@ -5,7 +5,6 @@ PACKAGES=(
 'git'
 )
 REPOSITORY='rwx.work/cd'
-TARGET='/usr/local/sbin'
 
 for nameserver in "${NAMESERVERS[@]}" ; do
     echo "nameserver ${nameserver}" \
@@ -19,9 +18,10 @@ apt-get update \
 apt-get install --yes "${PACKAGES[@]}" \
 || exit
 
+DIRECTORY="$(mktemp --directory)" \
+|| exit
 git clone \
 "${GITHUB_SERVER_URL}/${REPOSITORY}" \
-"${TARGET}" \
+"${DIRECTORY}" \
 || exit
-
-cd-bootstrap.sh
+"${DIRECTORY}/bootstrap.sh"
diff --git a/cd-browse-workspace b/cmd/cd-browse-workspace.sh
similarity index 100%
rename from cd-browse-workspace
rename to cmd/cd-browse-workspace.sh
diff --git a/cd-build-project b/cmd/cd-build-project.sh
similarity index 100%
rename from cd-build-project
rename to cmd/cd-build-project.sh
diff --git a/cd-clone-branch b/cmd/cd-clone-branch.sh
similarity index 100%
rename from cd-clone-branch
rename to cmd/cd-clone-branch.sh
diff --git a/cd-clone-python b/cmd/cd-clone-python.sh
similarity index 100%
rename from cd-clone-python
rename to cmd/cd-clone-python.sh
diff --git a/cd-install-packages b/cmd/cd-install-packages.sh
similarity index 100%
rename from cd-install-packages
rename to cmd/cd-install-packages.sh
diff --git a/cmd/cd-list-environment.sh b/cmd/cd-list-environment.sh
new file mode 100755
index 0000000..dd3fd37
--- /dev/null
+++ b/cmd/cd-list-environment.sh
@@ -0,0 +1 @@
+env | sort
diff --git a/cd-synchronize b/cmd/cd-synchronize.sh
similarity index 100%
rename from cd-synchronize
rename to cmd/cd-synchronize.sh