8.7 system ("ls -l") 系统调用

在c程序中调用。要加几个头文件还没弄清，

#include <stdio.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
// for tesing the fopen.c programe .it is cann't write integer array;

int main()
{
        FILE *pFile;
        int i;
        int buffer_integer[5];
        pFile = fopen( "a.txt", "r" );
        if( pFile ==NULL) { perror( "error file open" ); }
        else
        {
          fread( buffer_integer, 4, 5, pFile );
        }
        fclose( pFile );
        for( i=0; i<5; i++)
        {
          printf( "%d \n", buffer_integer[i] );
        }
        system( "ls -l " );
        return 0;
}


==显示结果

 ./ftest
1
2
3
4
5
total 36
-rw-r--r-- 1 zhuyadong zhuyadong  169 2008-08-06 23:26 a.txt
-rwxr-xr-x 1 zhuyadong zhuyadong 7492 2008-08-06 22:16 fopen
-rw-r--r-- 1 zhuyadong zhuyadong  864 2008-08-06 22:16 fopen.c
-rwxr-xr-x 1 zhuyadong zhuyadong 6946 2008-08-06 23:27 ftest
-rw-r--r-- 1 zhuyadong zhuyadong  503 2008-08-06 23:26 ftest.c
-rw-r--r-- 1 zhuyadong zhuyadong 1208 2008-08-06 23:26 ftest.o
-rw-r--r-- 1 zhuyadong zhuyadong   92 2008-08-06 22:43 Makefile