使用system函數

system函式宣告為：  int system(const char *string)；string為你要輸入的命令。  執行個體如下：/* * Demonstrate the system() call */#include <stdio.h>#include <stdlib.h>int main(){int retval;//retval is the return value of the system callretval = system("ls -l");if(retval == 127){fprintf(stderr, "/bin/sh not available\n");exit (127);}else if(retval == -1){perror("system");exit(EXIT_FAILURE);}else if(retval != 0){fprintf(stderr, "command returned %d\n", retval);perror("ls");}else{puts("command successfully executed");}return (0);}