Common UNIX Commands

1.Xcode Operating principle

• When we click Run, Xcode automatically does the following things for us:
  • Compile--->.o (target file)---> Links--->.out execution

2. Common UNIX Commands

• Mac system uses UNIX file system, all files are placed in the root directory/below, so there is no concept of windows in the C-drive, D-Disk
• Because Mac systems are UNIX-based, you can enter some UNIX instructions in "terminal" to manipulate UNIX directives commonly used in Mac systems: (It is not easy to forget if you need to use it frequently)ls :列出当前目录下的所有内容(文件\文件夹) pwd :显示出当前目录的名称
cd :改变当前操作的目录
who :显示当前用户名
clear :清除所有内容
mkdir : 创建一个新目录
rm: 删除文件
rm -r: 删除文件夹 -f 强制删除
touch: 创建文件
vi /open:打开、创建文件
  -q 退出
  -wq 保存并退出
  -q!强制退出
  i 进入编辑模式
  esc 退出编辑模式
  :wq!
cat/more 都可以查看文件内容

Common UNIX Commands