char *exec_command_line(ExecCommand *c);
void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix);
void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix);
+void exec_command_append_list(ExecCommand **l, ExecCommand *e);
void exec_context_init(ExecContext *c);
void exec_context_done(ExecContext *c);