diff --git a/sh/main.sh b/sh/main.sh
index d96d776..8339831 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -26,13 +26,12 @@ RWX_SELF_NAME="rwx"
 # │ main │ variables │
 # ╰──────┴───────────╯
 
-RWX_COMMAND_ARGUMENT="${0}"
 # currently running shell name
 RWX_SHELL="$(cat "/proc/${$}/comm")"
 
 # command name used to run
 # (stripped from hyphen interactive flag)
-RWX_COMMAND_NAME="$(basename "${RWX_COMMAND_ARGUMENT}" | sed "s|^-||")"
+RWX_COMMAND_NAME="$(basename "${0}" | sed "s|^-||")"
 case "${RWX_COMMAND_NAME}" in
 "bash" | "dash" | "sh") unset RWX_COMMAND_NAME ;;
 *) ;;