# 聯合部課 - Linux

## Installation

### WSL
https://hackmd.io/@Kailyn/BkMi80IeF
https://hackmd.io/@Kailyn/H1N5OPKlF
1. 以系統管理員身份打開PowerShell輸入

wsl --install

2. 重新開機
3. 以系統管理員身份打開PowerShell輸入

wsl --install -d Ubuntu

4. 設定使用者帳號密碼
5. 測試: 在「開始」開啟ubuntu或wsl

### VSCode
install: https://code.visualstudio.com/

#### Using WSL in VSCode



## Basic Commands
### File & Directory Related
#### Listing Files/Directories (**ls**)
- ```ls```
- Files are denoted in white color
- Directories are denoted in blue color


- to show all hidden information, use ```ls -al```


#### Create a Directory (**mkdir**)
- ```mkdir {directory name}```


#### Go To Another Directory (**cd**)
- ```cd {directory name}```

- ```cd ..``` 會回到上一層directory
- ```cd ~``` 會回到home directory

#### Show Current Directory (**pwd**)

- ```pwd```


#### Create a File (**touch**)
- ```touch {file name}```


#### Edit Content of a File (**vim**)
- ```vim {file name}```


- press `i` to insert new context, and press `esc` when finishing inserting
- use ```:wq!``` to save new change and quit


#### View Content of a File (**cat**)
- ```cat {file name}```


- you can add `grep` command to search the word in the file


#### Remove a File/Directory (**rm**)
- ```rm {file name}```


- to remove a directory which is not empty, add ```-r``` tag


#### Copy File/Directory (**cp**)
- ```cp {source} {target}```


- if you want to copy a directory, add ```-r``` tag


#### Move the File/Directory (**mv**)
- ```mv {source} {target}```


- ```mv``` can also be used to rename file


### User Related
#### Give Administrative Access to Another User (**su**)
- ```su {user name}```


#### Grant Administrative Access (**sudo**)

- ```sudo {command}```
- if you encounter some permission issue, try to add ```sudo``` before the original command


- to check how much sudo access you have, run ```sudo -l```


#### Create/Change Password (**passwd**)
- ```passwd {user name}```


#### Update Package Information to System (**apt-get update**)
- ```sudo apt-get update```


#### Update Packages to Latest Version (**apt-get upgrade**)
- ```sudo apt-get upgrade```
- run ```sudo apt-get update``` first


#### Install New Dependencies (**apt install**)
- ```sudo apt install {dependency name}```


### Compression/Packaging Related
#### Zip a Folder (**zip**)
- ```zip {zip name} {folder}```


#### Unzip a Folder (**unzip**)
- ```unzip {zip name}```


- to unzip to another directory, add ```-d``` flag


#### Other File Format
ref : http://note.drx.tw/2008/04/command.html

### Networking Related
#### Check NIC(網卡) & IP Address (**ip**)
- ```ip a```


- to check ipv4 address, use ```ip -4 a```. Similarly, to chack ipv6 address, use ```ip -6 a```


- to show information of a single NIC, use ```ip a show {NIC name}```


#### Check the Connectivity of Two Nodes (**ping**)
- ```ping {destination}```


#### Check Domain Name or IP address of a Node (**host**)
- ```host {domain name} or {IP address}```


#### Create Remote Connection through ssh Protocol (**ssh**)
- ```ssh {user name}@{host(IP/domain name)}```
- if you want to specify which port to connect, add ```-p``` tag

### Other Important Commands
#### Clear terminal (**clear**)
- ```clear```

#### Show the Disk Space Used (**df**)
- ```df```


#### Show Unmounted Disk (**lsblk**)
- ```lsblk```