#include <stdio.h>
#include <unistd.h>
int main()
{
        FILE *fd;
        char ret[1024] = {0};
        fd = popen("ps","r");	
        int nread = fread(ret,1,1024,fd);		//將獲取的內容存放在ret快取區中
        printf("num = %d byte,ret:\n%s",nread,ret);
        return
 
 0;
}

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