# Raspbian
$ sudo apt install raspberrypi-kernel-headers

$ pip3 install RPIO

# play audio
$ sudo apt-get install sox libsox-fmt-all
$ play file-name.mp3

# turn volume
$ amixer set Master 50%
$ amixer set Master 10%+

# slelect speaker
$ alsamixer
## F6 to select device

# set volume over 100%
$ sudo apt install pulseaudio
$ pulseaudio --start -D
$ pulseaudio --check -v # check
$ sudo apt-get install pulseaudio-utils
$ pactl set-sink-volume 0 300%

# install
$ sudo apt-get install libjpeg8-dev imagemagick

# setup and test
https://www.raspberrypi.org/documentation/configuration/camera.md

# official documents
https://www.raspberrypi.org/documentation/raspbian/applications/camera.md

# web stream
https://blog.miguelgrinberg.com/post/stream-video-from-the-raspberry-pi-camera-to-web-browsers-even-on-ios-and-android
https://blog.miguelgrinberg.com/post/how-to-build-and-run-mjpg-streamer-on-the-raspberry-pi
## 注释 mjpg-streamer/util.c stats.h
# // #include <linux/stat.h>
# // #include <sys/stat.h>

# generate stream
$ raspistill --nopreview -w 640 -h 480 -q 5 -o /home/pi/test.jpg -tl 100 -t 9999999 -th 0:0:0

# serve stream
$ LD_LIBRARY_PATH=/usr/local/lib mjpg_streamer -i "input_file.so -f /home/pi -n test.jpg" -o "output_http.so -w /usr/local/www"

# watch
http://rpi-ip:8080

$ lscpu

$ lspci

$ lsblk

# 查看挂载的节点和对应的分区 UUID
$ ls -lha /dev/disk/by-uuid

# 查看块设备的信息，包含 UUID
$ blkid /dev/sda1

$ parted -l
# 或
$ fdisk -l

$ mkfs [options] [-t type fs-options] device [size]

$ sudo mkfs -t ext4 /dev/sda

$ dmsetup status
$ dmsetup remove <>
$ dmsetup remove_all # 清楚所有, 谨慎使用, 最好挨个删除

$ sudo parted -a optimal /dev/sda
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) select /dev/sdb       # 切换至 /dev/sdb
Using /dev/sdb

(parted) mklabel [partition_table_type]

(parted) mklabel gpt

(parted) print

# 主分区
(parted) print free
(parted) mkpart primary [start] [end]  # 主分区模式

# lvm 分区
(parted) unit s
(parted) mkpart LVM ext4 0% 100%

(parted) mkpart primary 0.00B 100GB   # 按容量 
(parted) mkpart primary 0 100%        # 按比例

$ sudo mkfs.ext4 /dev/sda1

$ sudo mkdir data
$ sudo mount -t auto /dev/sda1 /data

$ sudo parted /dev/sda
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: ATA Hitachi HUS72404 (scsi)
Disk /dev/sda: 4001GB
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system  Flags
 1      0.00B  4001GB  4001GB  ext4

(parted) mklabel gpt
Warning: The existing disk label on /dev/sda will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? yes
(parted) print
Model: ATA Hitachi HUS72404 (scsi)
Disk /dev/sda: 4001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number  Start  End  Size  File system  Name  Flags
(parted) mkpart primary 4096s 100%       # 创建分区表
(parted) print
Model: ATA Hitachi HUS72404 (scsi)
Disk /dev/sda: 4001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name     Flags
 1      2097kB  4001GB  4001GB               primary
$ sudo mkfs.ext4 /dev/sda1
...
$ sudo mount -t auto /dev/sda1 /data
$ df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  32G     0   32G   0% /dev
tmpfs                     32G     0   32G   0% /dev/shm
tmpfs                     32G  2.0G   30G   7% /run
tmpfs                     32G     0   32G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G  4.2G   46G   9% /
/dev/nvme0n1p2          1014M  233M  782M  23% /boot
/dev/nvme0n1p1           200M   12M  189M   6% /boot/efi
/dev/mapper/centos-home  395G  332M  394G   1% /home
tmpfs                    6.3G   12K  6.3G   1% /run/user/42
tmpfs                    6.3G     0  6.3G   0% /run/user/1000
/dev/sda1                3.6T   89M  3.4T   1% /data

# 分区
parted --script /dev/vdb \
	mklabel gpt \
	mkpart primary 4096s 100% 
	
# 格式化
mkfs.ext4 /dev/vdb1

# 挂载
mount -t auto /dev/vdb1 /data

# 写入 /etc/fstab, root 用户运行
echo -e "UUID=$(blkid -o value -s UUID /dev/vdb1)\t/data\text4\tdefaults\t0 0" >> /etc/fstab


echo -e "UUID=$(blkid -o value -s UUID /dev/sdb1)\t/downloads\text4\tdefaults\t0 0" >> /etc/fstab

sudo lvmdiskscan

sudo lvmdiskscan -l
# 或
sudo pvscan

# 如果需要展示更多信息
sudo pvs
# 或
sudo pvdisplay
sudo pvdisplay -m # 查看映射到每个卷的逻辑扩展名

sudo vgscan

sudo lvscan
# 或
sudo lvs

# 列出所有可用的设备
sudo lvmdiskscan

sudo parted /dev/sda
(parted) mktable msdos
(parted) quit

sudo pvcreate /dev/sda
# 多个设备
sudo pvcreate /dev/sda /dev/sdb 

sudo vgcreate lvm-storage /dev/sda
# 多个设备
sudo vgcreate lvm-storage /dev/sda /dev/sdb 

# 创建指定 size
sudo lvcreate -L 500G -n lvm-storage-hadoop lvm-storage

# 使用所有剩余空间
sudo lvcreate -l 100%FREE -n lvm-storage-hadoop lvm-storage

sudo mkfs.ext4 /dev/<lvm-vg-name>/<lvm-lv-name> 

sudo mount /dev/<lvm-vg-name>/<lvm-lv-name> /path/to/destination

# 查看 logical volume 的 uuid
sudo blkid
/dev/mapper/<lvm-lv-name>: UUID="0192e4be-db57-4dc9-9f07-cb7bd673811b" BLOCK_SIZE="4096" TYPE="ext4"
# 添加自动挂载
sudo vim /etc/fstab
# 新增如下内容
UUID=0192e4be-db57-4dc9-9f07-cb7bd673811b       /storage/hadoop    ext4    defaults        0       2

sudo vgextend <volume-group-name> /dev/sdb

sudo lvresize -L +5G --resizefs <lvm-vg-name>/<lvm-lv-name>  # 调整 lvm size
sudo lvresize -l +100%FREE /dev/<lvm-vg-name>/<lvm-lv-name>  # 使用所有剩余空间
# sudo lvdisplay; 找到 Logical Volume 的 LV Path
sudo resize2fs <lv-path>	# 生效

$ sudo vgdisplay  # 查看 vg 信息
$ sudo lvdisplay  # 查看 lv 信息
$ sudo lvextend -l +100%FREE -r /dev/ubuntu-vg/ubuntu-lv

sudo umount /dev/<lvm-vg-name>/<lvm-lv-name>
sudo lvremove <lvm-vg-name>/<lvm-lv-name>

sudo umount /dev/<lvm-vg-name>/* # unmount vg 下所有 lv
sudo vgremove <lvm-vg-name>

sudo pvremove /dev/sda

sudo dmidecode --type connector
# 可以查看 USB、SATA、M.2 接口

# interfaces; configured by dns-nameserver
$ cat /etc/network/interfaces
...
auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
	address 192.168.8.160
	netmask 255.255.255.0
	network 192.168.8.1
	gateway 192.168.8.1
	broadcast 192.168.8.255
	wpa-essid "<wifi-id>"
	wpa-psk "<wifi-password>"
	dns-nameserver 8.8.8.8
	dns-nameserver 8.8.4.4
	dns-nameserver 192.168.8.1

export http_proxy=socks5://<host>:<port>
export https_proxy=socks5://<host>:<port>

# 设置代理
git config --global https.proxy socks5://<host>:<port>
git config --global https.proxy socks5://<host>:<port>

# 取消
git config --global --unset http.proxy
git config --global --unset https.proxy

via : [FAMILY] ADDRESS, 指定下一跳地址
src : ADDRESS, 发送至目的地时优先使用的源地址

# show table
ip route show table all
ip route show table 10

# add table
ip route add 192.168.6.0/24 dev br0 table 10
ip route add default via 192.168.6.1 table 10

# 删除 table
ip route delete table 12 192.168.9.0/24

# show rule
ip rule show

# 添加
ip rule add from 192.168.6.0/24 table 10 priority 1

# 添加
ip route add default via 192.168.1.1 dev eth0

# 更新 (所有配置都要添加vc)
ip route replace default via 192.168.1.1 dev eth0

# github ip 走网关 192.168.6.68 
sudo ip route add 20.205.243.166 via 192.168.6.68 

# 添加路由
route -q -n add -inet 192.168.6.0/24 -interface utun3

$ traceroute -4 baidu.com
$ traceroute -6 baidu.com  # ipv6
$ traceroute -g 192.168.6.1 # 指定 gateway

# 客户端抓取向服务端发送的数据
$ tcpdump dst host {dst-host} and  dst port {dst-port} -w out.pacp

.idea/

# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class

# C extensions
*.so

# Distribution / packaging
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
*.egg-info/
.installed.cfg
*.egg
MANIFEST

# PyInstaller
#  Usually these files are written by a python script from a template
#  before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec

# Installer logs
pip-log.txt
pip-delete-this-directory.txt

# Unit test / coverage reports
htmlcov/
.tox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
.hypothesis/

# Translations
*.mo
*.pot

# Django stuff:
*.log
.static_storage/
.media/
local_settings.py

# Flask stuff:
instance/
.webassets-cache

# Scrapy stuff:
.scrapy

# Sphinx documentation
docs/_build/

# PyBuilder
target/

# Jupyter Notebook
.ipynb_checkpoints

# pyenv
.python-version

# celery beat schedule file
celerybeat-schedule

# SageMath parsed files
*.sage.py

# Environments
.env
.venv
env/
venv/
ENV/
env.bak/
venv.bak/

# Spyder project settings
.spyderproject
.spyproject

# Rope project settings
.ropeproject

# mkdocs documentation
/site

# mypy
.mypy_cache/

$ ssh-keygen -t ed25519 -C "<your email>"

# 不推荐
$ ssh-keygen -t rsa -C "<your email>"              # id_rsa
$ ssh-keygen -t rsa -C "<your another email>"      # id_rsa_work

$ git config --global user.name "sunzhenkai"
$ git config --global user.email "zhenkai.sun@qq.com"

# 生成公钥
$ ssh-keygen -t rsa -C "<your email>"              # id_rsa
$ ssh-keygen -t rsa -C "<your another email>"      # id_rsa_work

# 配置 config
$ vim ~/.ssh/config
Host github.com
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa

Host github.com-work
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_work
    
# 指定账号添加对应公钥
    
# 使用, 克隆或添加remote时使用config定义的Host别名(github.com / github.com-work / 其他)
$ git clone git@github.com:<user-name>/<repo-name>.git
$ git remote add origin git@github.com:<user-name>/<repo-name>.git

# 暂存
$ git stash save 'message'

# 查看暂存
$ git stash list

# 恢复并删除暂存
$ git stash pop stash@{?}

# 只恢复，不删除暂存
$ git stash apply stash@{?}

# 删除暂存
$ git stash drop stash@{?}

# 删除所有暂存
$ git stash clear

# 添加子模块
$ git submodule add <git-address> <localpath>

# 初始化/下载子模块代码
git submodule update --init --recursive

# 递归clone
$ git clone ... --recursive
$ git clone --recurse-submodules ...

# pull with submodules
$ git pull --recurse-submodules

# 更新子模块至最新提交
$ git submodule update --remote --merge

# 重置 submodule commit id
git submodule update --init

$ rm -rf path/to/submodule
$ rm -rf .git/modules/{module}
$ vim .gitmodules # 移除对应 module
$ vim .git/config # 移除对应 module

$ git tag -s "tag_name" -m "comments"
# push 到远端
$ git push origin <tag-name>	# one
$ git push --tags							# all
$ git push origin --tags			# all

git filter-branch -f --prune-empty --index-filter "git rm -rf --cached --ignore-unmatch recommend/keywords.txt" --tag-name-filter cat -- --all

# 设置用户名、邮箱
git config user.name "New User"
git config user.email "newuser@gmail.com"

git log
git rebase -i <commit-id> # 这个 commit-id 需要修改的前一个
# 把需要修改的 commit 前的 'pick' 改为 'edit', 保存并退出

# 重复下面两步
git commit --amend --reset-author --no-edit
git rebase --continue

# 强制提交
git push --force-with-lease

git blame <file> -L <start-line>,<end-line>

# 删除分支
git push origin --delete <branch>

# 检出 /path/pattern 下文件在 tree-ish 下的状态
git checkout {tree-ish} /path/pattern  # 主要后面的 path, 存放 checkout 出来的文件

git archive f9ee8bb31f04f4e6a8c0d3e96fbb98deeb448d45 | tar -x -C /tmp/f9ee8bb31f04f4e6a8c0d3e96fbb98deeb448d45

git archive --remote=https://github.com/user/repo.git <tree-ish> | tar -x -C /path/to/target-dir

# 打印配置
git config -l
# 打印全局配置
git config --global -l	# 当前用户的配置
git config --sysmte -l	# 系统配置

          默认仓库级别
--system  系统
--global  用户目录

git config user.name '...'
git config user.email '...'

# 设置
git config --global http.proxy http://user:password@domain:port
git config --global https.proxy http://user:password@domain:port

# 取消设置
git config --global --unset http.proxy
git config --global --unset https.proxy

feature/JIRA-1929-support-oneid

/opt/rh/rh-git218/root/usr/libexec/git-core/git-remote-http: error while loading shared libraries: libcurl-httpd24.so.4: cannot open shared object file: No such file or directory

find / -name 'libcurl-httpd24.so.4'
/opt/rh/httpd24/root/usr/lib64/libcurl-httpd24.so.4

# 修改 LD_LIBRARY_PATH 环境变量
# vim ~/.bashrc
export LD_LIBRARY_PATH=/opt/rh/httpd24/root/usr/lib64:$LD_LIBRARY_PATH

source ~/.bashrc