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int system(const char * string);
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main()
{
system(“ls -al /etc/passwd /etc/shadow”);
}
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-rw-r--r-- 1 root root 705 Sep 3 13 :52 /etc/passwd
-r--------- 1 root root 572 Sep 2 15 :34 /etc/shado
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char tmp[];
sprintf(tmp,"/bin/mount -t vfat %s /mnt/usb",dev);
system(tmp);
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#include
#include
#include
#include
int system(const char * cmdstring)
{
    pid_t pid;
    int status;
    if(cmdstring == NULL){
         
         return (1);
    }
    if((pid = fork())<0){
            status = -1;
    }
    else if(pid == 0){
        execl("/bin/sh", "sh", "-c", cmdstring, (char *)0);
        -exit(127); //×Ó½ø³ÌÕý³£Ö´ÐÐÔò²»»áÖ´ÐдËÓï¾ä
        }
    else{
            while(waitpid(pid, &status, 0) < 0){
      &nbs


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