# Exercise 1 - lslinux常用命令, cd, pwd
## 1.Experiment Introduction
#### 1.1 Experiment Content
This experiment will introduce the use of ls, cd, pwd commands in Linux commands.
#### 1.2 Experimental Knowledge Points
- ls Command
- cd Command
- pwd Command
#### 1.3 Experiment Environment
The experimental environment used in the course is Ubuntu Linux 14.04 64-bit version. The program will be used in the experiment:
- Xfce terminal
## 2.Experiment Procedure
### 2.1 ls Command
The ls command is the most commonly used command in linux, and the ls command is an acronym for list.
Ls is used to print a list of current directories. If ls specifies a different directory, then the list of files and folders in the specified directory will be displayed.
By using the ls command, you can view not only the files contained in the linux folder, but also file permissions (including directories, folders, and file permissions) and directory information, and so on.
**(1) Command Format**
> ls [OPTION]
**(2) Common Parameters**
| Parameter | Description|
| --------- | ------------------------------------------------------------ |
| -a| -all List all files in the directory, including hidden files beginning with . |
| -l| In addition to the file name, the file permissions, owner, file size, etc. are listed in detail. |
| -d| -directory displays the directory as a file instead of the file in it |
| -h| ?
