Update userspace

apps/base/echo/echo.c

@@ -2,6 +2,12 @@
 
 int main(int argc, char *argv[])
 {
+	if (argc == 1)
+	{
+		printf("Usage: echo [args]\n");
+		return 0;
+	}
+
 	for (int i = 1; i < argc; i++)
 		printf("%s ", argv[i]);
 	printf("\n");

apps/base/fsh/Makefile

@@ -28,7 +28,7 @@ endif
 OBJ = $(C_SOURCES:.c=.o) $(CPP_SOURCES:.cpp=.o) $(ASM_SOURCES:.asm=.o) $(S_SOURCES:.S=.o) $(PSF_SOURCES:.psf=.o) $(BMP_SOURCES:.bmp=.o)
 
 SYSROOT = --sysroot=$(WORKSPACE)out/
-FILENAME = fsh
+FILENAME = sh
 
 HEADERS = $(sort $(dir $(wildcard $(WORKSPACE)out/include/*)))