diff --git a/launch.sh b/launch.sh
index 2f3d90d..7930ae9 100755
--- a/launch.sh
+++ b/launch.sh
@@ -83,13 +83,13 @@ not_implemented() {
 show_help() {
   echo    "$PROGRAM COMMAND [arg ...]"
   echo -e "  Where ${green}COMMAND${reset} is one of:"
+  echo -e "   - backup          Create a compressed postgreSQL database dump
+                     in current directory"
   echo -e "   - create          Create postgreSQL database volume and
                      postgreSQL Docker container"
   echo -e "   - dev [arg ...]   Mount Git repository directory AS VOLUME
                      for Gissmo Docker container and launch it in
                      'development' mode"
-  echo -e "   - export          Create a compressed postgreSQL database dump
-                     in current directory"
   echo -e "   - init            Create project directory as python virtual
                      environment, fetch git repository and install
                      Python dependancies"
@@ -111,12 +111,12 @@ show_help() {
 
 check_command() {
   # Allowed commands return 0 to continue. Otherwise show help and exit
-  if test $1 == "create"; then
+  if test $1 == "backup"; then
+    return 0
+  elif test $1 == "create"; then
     return 0
   elif test $1 == "dev"; then
     return 0
-  elif test $1 == "export"; then
-    return 0
   elif test $1 == "init"; then
     return 0
   elif test $1 == "psql"; then
@@ -196,7 +196,7 @@ another name please set GISSMO_DOCKER_NAME in configuration file."
   fi
 }
 
-test_export() {
+test_backup() {
   # Check postgreSQL Docker container exists and is launched.
   test_postgresql_launched
   if [ $? -eq 1 ]; then
@@ -204,12 +204,12 @@ test_export() {
   fi
 }
 
-export_command() {
+backup() {
   # Check all variables are availables
   test_create
   # Then check some specific things for dump method
-  test_export
-  $docker_cmd run -it --rm --volume $PWD/:/tmp/ --link ${POSTGRES_DOCKER_NAME}:db postgres:${POSTGRES_VERSION} bash -c 'exec pg_dump -F c -h "$DB_PORT_5432_TCP_ADDR" -p "$DB_PORT_5432_TCP_PORT" -U postgres postgres > /tmp/gissmo-`date +"%Y.%m.%d.%H%M"`-'${GISSMO_VERSION}'.dump' || error_and_quit "Failed to export Gissmo database."
+  test_backup
+  $docker_cmd run -it --rm --volume $PWD/:/tmp/ --link ${POSTGRES_DOCKER_NAME}:db postgres:${POSTGRES_VERSION} bash -c 'exec pg_dump -F c -h "$DB_PORT_5432_TCP_ADDR" -p "$DB_PORT_5432_TCP_PORT" -U postgres postgres > /tmp/gissmo-`date +"%Y.%m.%d.%H%M"`-'${GISSMO_VERSION}'.dump' || error_and_quit "Failed to backup Gissmo database."
 }
 
 init() {
@@ -221,7 +221,7 @@ init() {
     virtualenv -p python3 $PROJECT_DIR || error_and_quit "Create ${PROJECT_DIR} python virtual environment failed."
     info "Python virtual environment initialized."
   fi
-  cd $PROJECT_DIR
+  cd "$PROJECT_DIR"
   # On Fedora 23: gcc postgresql-devel python3-devel python-virtualenv git-core python3-pip redhat-rpm-config gmp-devel
   sudo apt-get install -qq libpq-dev python3-dev python-virtualenv git-core python3-pip || error_and_quit "Dependancies installation failed."
   info "Dependancies via apt-get checked/installed."
@@ -236,8 +236,8 @@ init() {
     cp "${GISSMO_DIR}/scripts/git_hooks/pre-commit" "${GISSMO_DIR}/.git/hooks/pre-commit" || error_and_quit "Failed to install pre-commit hook."
     info "Git repository pre-commit hook installed."
   fi
-  . bin/activate || error_and_quit "Failed entering python virtual environment"
-  cd $GISSMO_DIR
+  source bin/activate || error_and_quit "Failed entering python virtual environment"
+  cd "$GISSMO_DIR"
   pip install -q -r requirements.txt || error_and_quit "Python dependancies 
 installation failed."
   info "Python dependancies checked."
@@ -294,11 +294,11 @@ test_initial_start() {
   fi
   # Build Gissmo Docker images if missing
   if [[ "$($docker_cmd images -q gissmo:${GISSMO_VERSION} 2> /dev/null)" == "" ]]; then
-    cd $GISSMO_DIR
+    cd "$GISSMO_DIR"
     info "Building Docker images…"
     $docker_cmd build -t gissmo:${GISSMO_VERSION} -f ${DOCKERFILE} . || error_and_quit "Failed to build Gissmo Docker container."
     info "…done."
-    cd $CURRENT_DIR
+    cd "$CURRENT_DIR"
   fi
   if test -z "$GISSMO_DOCKER_PORT"; then
     error_and_quit "No Gissmo Docker container port given 
@@ -362,13 +362,7 @@ fi
 
 if ! test -z $COMMAND; then
   check_command "$COMMAND"
-  # To avoid 'export' bash command reassignement which made some failure in
-  #+ Python virtualenv
-  if "$COMMAND" == "export"; then
-    export_command
-  else
-    $COMMAND
-  fi
+  $COMMAND
 else
   show_help
 fi