-int run_command(byte *cmd, ...);
-void NONRET exec_command(byte *cmd, ...);
-void echo_command(byte *buf, int size, byte *cmd, ...);
-int run_command_v(byte *cmd, va_list args);
-void NONRET exec_command_v(byte *cmd, va_list args);
-void echo_command_v(byte *buf, int size, byte *cmd, va_list args);
+int run_command(const char *cmd, ...);
+void NONRET exec_command(const char *cmd, ...);
+void echo_command(char *buf, int size, const char *cmd, ...);
+int run_command_v(const char *cmd, va_list args);
+void NONRET exec_command_v(const char *cmd, va_list args);
+void echo_command_v(char *buf, int size, const char *cmd, va_list args);