diff --git a/cd.sh b/cd.sh
index e054636..9af0f96 100644
--- a/cd.sh
+++ b/cd.sh
@@ -125,6 +125,7 @@ deb https://deb.debian.org/debian bookworm-backports main
 deb https://deb.debian.org/debian bookworm-updates main
 deb https://deb.debian.org/debian-security bookworm-security main
 "
+            cd_cat "/etc/apt/sources.list"
         ;;
         *) exit 1 ;;
     esac
@@ -142,6 +143,7 @@ APT::Install-Recommends False;
 APT::Install-Suggests False;
 Dir::Etc::SourceParts \"\";
 "
+            cd_cat "/etc/apt/apt.conf.d/apt.conf"
         ;;
         *) exit 1 ;;
     esac
@@ -154,6 +156,7 @@ cd_set_https_verification_off () {
             cd_write "/etc/apt/apt.conf.d/https" "\
 Acquire::https::Verify-Peer False;
 "
+            cd_cat "/etc/apt/apt.conf.d/https"
         ;;
         *) exit 1 ;;
     esac
@@ -196,7 +199,7 @@ local target
 cd_update_ca () {
     cd_step "Update CA"
     case "${CD_OS_NAME}" in
-        "debian") update-ca-certificates ;;
+        "debian") update-ca-certificates || exit ;;
         *) exit 1 ;;
     esac
 }
@@ -204,7 +207,7 @@ cd_update_ca () {
 cd_set_https_verification_on () {
     cd_step "Set HTTPS verification on"
     case "${CD_OS_NAME}" in
-        "debian") rm "/etc/apt/apt.conf.d/https" ;;
+        "debian") cd_rm "/etc/apt/apt.conf.d/https" ;;
         *) exit 1 ;;
     esac
 }
@@ -247,6 +250,7 @@ local root
     cd_step "Clone parent repositories"
     root="$(mktemp --directory)" || exit
     for repository in "${@}" ; do
+        echo "${repository}"
         git clone \
         "${CD_PROJECTS_URL}/${repository}" "${root}/${repository}" \
         || exit
@@ -266,8 +270,8 @@ cd_set_python_commands () {
 
 cd_cat () {
     if [ -f "${1}" ] ; then
-        echo "$(realpath "${1}")"
-        cat "${1}"
+        echo "↗$(realpath "${1}")"
+        cat "${1}" || exit
     fi
 }
 
@@ -280,6 +284,13 @@ cd_install_package () {
     fi
 }
 
+cd_rm () {
+    if [ -f "${1}" ] ; then
+        echo "×$(realpath "${1}")"
+        rm "${1}" || exit
+    fi
+}
+
 cd_step () {
     if [ "${1}" ] ; then
         CD_STEP=$((CD_STEP+1))
diff --git a/cd/__init__.py b/cd/__init__.py
index d2b4385..f1fce8a 100644
--- a/cd/__init__.py
+++ b/cd/__init__.py
@@ -31,4 +31,5 @@ def install_commands(path):
         'clone-branch',
         'list-environment',
     ]:
+        print(command)
         os.symlink(path, os.path.join(user, f'{COMMANDS_PREFIX}{command}'))