only accept one target for top

usr/local/share/bastille/top.sh

@@ -42,26 +42,15 @@ case "${1}" in
         ;;
 esac
 
-if [ $# -eq 0 ]; then
-    usage
-else
-    TARGET="${1}"
-    shift
-fi
-
-if [ "${TARGET}" = "ALL" ]; then
-    target_all_jails
-else
-    check_target_exists "${TARGET}"
-fi
-
-if [ $# -ne 0 ]; then
+# Accept only one argument
+if [ $# -eq 0 ] || [ $# -gt 1 ]; then
     usage
 fi
 
+set_target_single "${1}"
 bastille_root_check
 
-for _jail in ${JAILS}; do
+for _jail in "${JAILS}"; do
     check_target_is_running "${_jail}"
     info "[${_jail}]:"
     jexec -l "${_jail}" /usr/bin/top