Display command line in usage output. Useful to debug scripts with variables.
--- busybox-1.18.1/libbb/appletlib.c
+++ busybox-1.18.1/libbb/appletlib.c
@@ -97,9 +97,16 @@
 
 #endif /* FEATURE_COMPRESS_USAGE */
 
-
+static char **bb_argv;
 void FAST_FUNC bb_show_usage(void)
 {
+	full_write2_str("\nCommand line: ");
+	while (*bb_argv) {
+		full_write2_str(*bb_argv++);
+		full_write2_str(" ");
+	}
+	full_write2_str("\n\n");
+
 	if (ENABLE_SHOW_USAGE) {
 #ifdef SINGLE_APPLET_STR
 		/* Imagine that this applet is "true". Dont suck in printf! */
@@ -635,6 +642,7 @@
 /* If we were called as "busybox..." */
 static int busybox_main(char **argv)
 {
+	bb_argv = argv;
 	if (!argv[1]) {
 		/* Called without arguments */
 		const char *a;
@@ -785,6 +793,7 @@
 int main(int argc UNUSED_PARAM, char **argv)
 #endif
 {
+	bb_argv = argv;
 	/* Tweak malloc for reduced memory consumption */
 #ifndef PAGE_SIZE
 # define PAGE_SIZE (4*1024) /* guess */