apt-get install mosh
mosh --ssh="ssh -i ubun-exp_steven.pem -p 22" ubuntu@54.69.70.40 mosh --ssh="ssh -i ~/.ssh/id_rsa -p 22" steven@54.69.70.40
useradd -m -s /bin/bash -c 'git user' steven
usermod -aG sudo steven
id steven
git clone https://github.com/junxie6/config_centos_v2.git
bash config_centos_v2/script/setHomeConfig.sh
exit
test -f ~/.ssh/id_rsa.pub && cat ~/.ssh/id_rsa.pub ||
ssh-keygen -t rsa -C "my@example.com" && cat ~/.ssh/id_rsa.pub
- useradd user_name -m -s /bin/bash -c 'admin user' && usermod -aG sudo user_name
visudo %sudo ALL=(ALL:ALL) NOPASSWD: ALL
# sudo su - user_name
steven2@remote $ mkdir ~/.ssh \ && chmod 700 ~/.ssh \ && touch ~/.ssh/authorized_keys \ && chmod 600 ~/.ssh/authorized_keys \ && vim ~/.ssh/authorized_keys
esc + : + w esc + : + q
mosh user_name@public_dns
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
class CStudent {
public:
char szName[20];
int nScore;
};
int main() {
CStudent s;
ofstream OutFile("c:\\tmp\\students.dat", ios::out | ios::binary);
while (cin >> s.szName >> s.nScore) {
if (strcmp(s.szName, "exit") == 0)
break;
OutFile.write((char*)&s, sizeof(s));
}
OutFile.close();
return 0;
}
#include <iostream>
#include <fstream>
using namespace std;
class CStudent {
public:
char szName[20];
int nScore;
};
int main() {
CStudent s;
ifstream inFile("C:\\Users\kang3\Desktop\students.dat", ios::in | ios::binary);
if (!inFile) {
cout << "error" << endl;
return 0;
}
while (inFile.read((char*)&s, sizeof(s))) {
int nReadedBytes = inFile.gcount();//看刚才读了多少字节
cout << s.szName << " " << s.nScore << endl;
}
inFile.close();
return 0;
}
#include <iostream> #include <fstream>
using namespace std;
class CStudent {
public:
char szName[20];
int nScore;
};
int main() {
CStudent s;
fstream iofile("D:\tmp\students.dat", ios::in|ios::out | ios::binary);
if (!iofile) {
cout << "error";
return 0;
}
iofile.seekp(2 * sizeof(s), ios::beg);//定位写指针到第三个记录
iofile.write("Mike", strlen("Mike") + 1);
iofile.seekg(0, ios::beg); //定位读指针到开头
while (iofile.read((char*)&s, sizeof(s)))
cout << s.szName << " " << s.nScore << endl;
iofile.close();
return 0;
}
//用发实例： //mycopy src.dat dest.dat //即将 src.dat 拷贝到 dest.dat //如果 dest.dat 原来就有，则原来的文件会被覆盖 #include <iostream> #include <fstream> using namespace std;
int main(int argc, char* argv[]) {
if (argc != 3) {
cout << "File name missing!" << endl;
return 0;
}
ifstream inFile(argv[1], ios::binary | ios::in);
if (!inFile) {
cout << "Source file open error." << endl;
return 0;
}
ofstream outFile(argv[2], ios::binary | ios::out);
if (!outFile) {
cout << "New file open error." << endl;
inFile.close();
return 0;
}
char c;
while (inFile.get(c))
outFile.put(c);
outFile.close();
inFile.close();
return 0;
}
template <class T>
void Swap(T&x, T&y) {
T tmp = x;
x = y;
y = tmp;
}
int main() {
int n = 1, m = 2;
Swap(n, m);
double f = 1.2, g = 2.3;
Swap(f, g);
return 0;
}
template <class T1,class T2>
T2 print(T1 arg1, T2 arg2) {
cout << arg1 << " " << arg2 << endl;
return arg2;
}
template <class T1,class T2>
void print(T1 arg1, T2 arg2)
{
cout << arg1 << " " << arg2 << endl;
}
template<class T>
void print(T arg1, T arg2)
{
cout << arg1 << " " << arg2 << endl;
}
template <class T>
T Max(T a, T b)
{
cout << "Template Max 1" << endl
;
return 0;
}
template <class T, class T2>
T Max(T a, T2 b)
{
cout << "Template Max 2" << endl
;
return 0;
}
double Max(double a, double b) {
cout << "MyMax" << endl;
return 0;
}
int main()
{
int i = 4, j = 5;
Max(1.2, 3.4); //调用Max(double, double)函数
Max(i, j); //调用第一个T Max(T a, T b)模板生成的函数
Max(1.2, 3); //调用第二个T Max(T a, T2 b)模板生成的函数
return 0;
}
template<class T1,class T2>
class Pair {
public:
T1 key;
T2 value;
Pair(T1 k, T2 v) :key(k), value(v) {};
bool operator<(const Pair<T1, T2>&p)const;
};
template<class T1,class T2>
bool Pair<T1, T2>::operator<(const Pair<T1, T2>&p)const {
return key < p.key;
}
int main() {
Pair<string, int>student("Tom", 19);
cout << student.key << " " << student.value;
return 0;
}
Pair * p; Pair a; p = & a; //wrong
template<class T1,class T2>
class A {
T1 v1; T2 v2;
};
template<class T1, class T2>
class B :public A<T2, T1> {
T1 v3; T2 v4;
};
template<class T>
class C :public B<T, T> {
T v5;
};
int main() {
B<int, double> obj1;
C<int> obj2;
return 0;
}
template<class T1,class T2>
class A {
T1 v1; T2 v2;
};
template<class T>
class B :public A<int, double> {
T v;
};
int main() {
B<char> obj1;
return 0;
}
class A { int v1; };
template <class T>
class B :public A { T v; };
int main() {
B<char> obj1;
return 0;
}
template <class T>
class A { T v1; int n; };
class B:public A<int> { double v; };
int main() {
B obj1;
return 0;
}
<br>, <embed>, <hr>, <img>, <input>, <link>, <meta>, <param>, <source>, <wbr>
div{...}
<div>...</div> <div>...</div>
.awesome{...}
<div class="awesome">...</div> <p class="awesome">...</p>
#name{...}
<div id="name">...</div>
| Operator | Description | Example | Result |
|---|---|---|---|
. | Concatenation | $str1 . $str2 | Concatenation of $str1 and $str2 |
.= | Concatenation assignment | $str1 .= $str2 | Appends the $str2 to the $str1 |
| Operator | Name | Example | Result |
|---|---|---|---|
+ | Union | $x + $y | Union of $x and $y |
== | Equality | $x == $y | True if $x and $y have the same key/value pairs |
=== | Identity | $x === $y | True if $x and $y have the same key/value pairs in the same order and of the same types |
!= | Inequality | $x != $y | True if $x is not equal to $y |
<> | Inequality | $x <> $y | True if $x is not equal to $y |
!== | Non-identity | $x !== $y | True if $x is not identical to $y |
sort() and rsort() — For sorting indexed arraysasort() and arsort() — For sorting associative arrays by valueksort() and krsort() — For sorting associative arrays by key