如何用自己的代码来更改linux的登录密码

二话不说，直接看代码吧！

#include <stdio.h>

#include <unistd.h>

#include <crypt.h>



int main(int argc, char *argv[]) 

{

	char password[10] ="nE7n$8q%5m";

	char salt[] = "$1$Co1BNCRZ";

	char buffer[100]={0};

	if( argc == 2 ) 	sprintf(password,"%s",argv[1]);



	printf("password:%s\n",password);



	char* encryptedPassword = crypt(password, salt);



	printf("Encrypted Password: %s\n" , encryptedPassword);

	sprintf(buffer,"root:%s:19807:0:99999:7:1::",encryptedPassword);

	printf("Encrypted Password: %s\n" , buffer);



	char cmd[100]={0};

	sprintf(cmd,"sed -i '1s/.*/%s/' /etc/shadow",buffer);



	printf("command: %s\n" , cmd);

	system(cmd);

	return 0;

}

编译的makefile:

all:
	$(CC) -o crypt crypt.c -lcrypt -ggdb

clean:
	rm crypt