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Linux Introduction (for Raspberry Pi Course)
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Tzu-ping Chung
August 19, 2015
Programming
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Linux Introduction (for Raspberry Pi Course)
Tzu-ping Chung
August 19, 2015
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Transcript
speakerdeck.com/ uranusjr
Agenda • Introduction • The shell • Git • Linux
topics • Writing code • Python basics • Python in shell • Extensions
Introduction to Linux
None
Me • Call me TP • https://uranusjr.com • Python, C++,
OS X, iOS, Web • Tutorials and courses • Speaker • Django Girls Taipei
Quick Polls • Something “not Windows” • Command line interface
• Plain text editors • Programming
None
None
Prompt
pi@raspberrypi:~$
pi@raspberrypi:~$ ⢪欽罏
pi@raspberrypi:~$ ⚺堣せ珕
pi@raspberrypi:~$ 騟䖜
Shell • Core — Shell — User • Command line
interface • Bash (Bourne-Again Shell)
$ pwd /home/pi
$ mkdir bedroom
$ ls bedroom Desktop
$ touch table
$ ls bedroom Desktop table
$ cd bedroom $ pwd 剙곎爙➊랁
$ mkdir closet
銲䙥랁鹌Ⰵ closet
$ cd closet
$ cd ../.. 植㖈➂㖈ㆬ酬♶銲⡲䒦
穩㼨騟䖜 /home/pi/bedroom/closet 湱㼨騟䖜 bedroom/closet
.. = 㢩
現在位置(.) /home/pi/bedroom/closet 外面兩層(../..) /home/pi
$ cd ~ $ cp -‐r bedroom guest-‐room
$ ls 剙⳿植➊랁
$ cd guest-‐room 酬僽やㄤ bedroom ♧垺剣♧ ⦐ closet銲䙥랁墝叆
拷貝一樣東西 cp something 拷貝一樣東西,以及裡面的所有東西 cp -r something
拷貝一樣東西 cp something 拷貝一樣東西,以及裡面的所有東西 cp -r something
չ侶պ䧴չ䒷侶պ
$ man cp ... -‐R, -‐r, -‐-‐recursive
copy directories recursively
$ cd .. 鸍垺剙ⵋㆬ酬
$ mv guest-‐room living-‐room $ ls 剙⳿植➊랁
$ mv living-‐room/closet bedroom/closet2 鸍⦐䭷⟀⨞✪➊랁✲䞔
$ rm ~/table $ rm -‐r ~/bedroom $
rm -‐r ~/living-‐room 敮嫅։
The File System • The root directory • Other partitions
are “mounted” • Things have their places • Names are case-sensitive
/ ├── bin ├── dev ├── etc ├── home │
└── pi ├── lib ├── media ├── opt ├── root ├── tmp ├── usr └── var
Permissions • Essential for Un*x systems • Owner, group, others
• Read, write, execute
$ groups pi adm dialout cdrom sudo audio
video plugdev games users netdev gpio i2c spi input
$ groups pi pi : pi adm dialout cdrom
sudo audio video plugdev games users netdev input spi i2c gpio
$ cd /var $ ls -‐l total 102436
drwxr-‐xr-‐x 8 root root Aug 16 05:17 log drwxrwsr-‐x 2 root mail May 6 22:12 mail -‐rw-‐-‐-‐-‐-‐-‐-‐ 1 root root May 6 23:29 swap drwxrwxrwt 2 root root Jan 11 2015 tmp
奚ꣳ垦硹 䠑纏 r 隡《 w 㻨Ⰵ x 㛂遤鹎Ⰵ湡ꏗ s ⟃暶㹁魨⟨㛂遤
t ⫦乩剤罏〳ⵅꤑ荈䊹涸墂呪
奚ꣳ垦硹 䠑纏 r 隡《 w 㻨Ⰵ x 㛂遤鹎Ⰵ湡ꏗ s ⟃暶㹁魨⟨㛂遤
t ⫦乩剤罏〳ⵅꤑ荈䊹涸墂呪
$ cd /var $ ls -‐l total 102436
drwxr-‐xr-‐x 8 root root Aug 16 05:17 log drwxrwsr-‐x 2 root mail May 6 22:12 mail -‐rw-‐-‐-‐-‐-‐-‐-‐ 1 root root May 6 23:29 swap drwxrwxrwt 2 root root Jan 11 2015 tmp
The Superuser • “root” • Can do anything • Log-in
disabled by default
/ ├── bin ├── dev ├── etc ├── home │
└── pi ├── lib ├── media ├── opt ├── root ├── tmp ├── usr └── var Superuser’s home directory!
sudo • “superuser do” • Run a command as superuser
• Requires the sudo group
$ groups pi pi : pi adm dialout cdrom
sudo audio video plugdev games users netdev input spi i2c gpio
$ whoami pi $ sudo whoami root
Package Manager • APT = Advance package Tool • apt-get
• apt-cache
$ sudo apt-‐get update $ sudo apt-‐get install git
Git Basics
None
None
$ cd ~ $ git clone https://github.com/raspberrypi-‐ tw/workshop.git
$ cd workshop/gpio-‐tutorial-‐03/02_2-‐ led_blink/led_blink.py $ ls led.py
$ python led.py
HJUDMPOF 䭡頺♧⦐(JU墂呪䏨 HJUBEE墂呪 䪾墂呪⸈Ⰵ墂呪䏨 HJUBEE〳⟃♧妄⸈Ⰵ鿈墂呪 HJUDPNNJUN鏽鎹 ⸈Ⰵ♧⦐晝劥 HJUTUBUVT 叆溏湡涸墂呪䏨朜䢀 HJUEJ
叆溏湡墂呪䏨ㄤ♳⦐晝劥⛓涸䊴殯 HJUMPH 叆溏晝劥鎹ꏗ HJUQVTI 㼟劥㖒墂呪䏨♳⫄荛黇畮 HJUQVMM 刿倞劥㖒Ⰹ㺂
How a Linux OS Boots
Boot Sequence • Load the kernel (details omitted) • Prepare
the system • Start services • Run custom startup hooks • User log in
Boot Sequence • Load the kernel (details omitted) • Prepare
the system • Start services • Run custom startup hooks • User log in
Run Levels ꡠ堥 ㋲➃笞隌垸䒭 搂/'4㢵➃垸䒭 㸤侮㢵➃垸䒭
⥃殆 㕮䕎➝ ꅾ堥
$ ls -‐d /etc/rc* /etc/rc0.d /etc/rc1.d /etc/rc2.d
/etc/rc3.d /etc/rc4.d /etc/rc5.d /etc/rc6.d /etc/rc.local /etc/rcS.d
$ ls -‐d /etc/rc* /etc/rc0.d /etc/rc1.d /etc/rc2.d
/etc/rc3.d /etc/rc4.d /etc/rc5.d /etc/rc6.d /etc/rc.local /etc/rcS.d
raspberrypi login:
$ ls -‐A ~ .bashrc .bash_logout
.bash_profile .profile $ ls -‐d /etc/profile* /etc/profile /etc/profile.d
Summary • Startup • Run levels • Single-user and multi-user
mode • Login shells and non-login shells
$ nano
None
^R ➿邌 Control
倰ぢ꒳ 獵⹛康垦 1H6Q 1H%O )PNF &OE 獵⹛康垦 ^O 㶸墂 ^R
㉬墂呪 ^X 鷎ⴀ剚鑉㉏僽や⮭㶸墂呪 ^W 䵃㼦 ^K 䭡頺♧遤俒㶶 ^U 顦♳⛓䭡頺涸俒㶶
Demo
Error writing /etc/hosts: Permission denied
Demo
Try it!
$ cd ~ $ git clone https://github.com/serialhex/ nano-‐highlight.git .nano
$ nano .nanorc
include "~/.nano/python.nanorc" set tabsize 4 set tabstospaces