# [Record] System and development environment setup on Raspberry Pi 2 Model B

###### tags: `env setup`, `ssh`, `telnet`, `samba`, `vsftp`, `fail2ban`, `ctags`, `cscope`, `tmux`, `tig`, `vim-plug`, `zsh`, `linux source insight`, `rpi`, `git server`, `proxy settings`

[toc]

# Preface

In this note, I record some procedures and demo how to setup and configure utility like tig, tmux, ctags or network services like ssh, telnet, FTP and SAMBA on a host or a server. I just use RPi2 as an example here.

# System Information

## Hardware
- Raspberry pi 2 model B
- Transcend 16GB MicroSD card

## Software
- Linux raspberrypi 5.4.79-v7
- NOOBS by ["How to install NOOBS?"](https://www.raspberrypi.org/help/noobs-setup./)

# Installed Packages
## Service

Tomas# apt-get install net-tools tcpd ssh samba xinetd telnetd vsftpd

## Utility

Tomas# sudo add-apt-repository ppa:x4121/ripgrep
Tomas# sudo apt-get update
Tomas# sudo apt-get install vim git tig zsh cscope ctags wget curl silversearcher-ag vim-scripts ripgrep tree members docker.io fail2ban tftpd-hpa tftp-hpa minicom
Tomas# sudo vim-addons install taglist

# for oh-my-zsh
Tomas# sh -c "$(wget -O- https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

# or
Tomas# sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

# for vim-plug
Tomas# sudo curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim

# Basic System Configuration
## Create users and groups

# Tomas is the originalest admin user in the system.
# 
# 1. Create a group
Tomas# sudo groupadd Superhero
Tomas# sudo mkdir /home/earth
Tomas# sudo chown Tomas:Superhero /home/earth

# 2. Create users
sudo useradd -m IronMan -G Superhero -s /bin/bash -d /home/earth/ironman
sudo useradd -m Hulk -G Superhero -s /bin/bash -d /home/earth/hulk

# 3. Let them as sudoers and be in the group of dialout to access tty devices
sudo usermod -aG sudo IronMan
sudo usermod -aG sudo Hulk
sudo usermod -aG dialout IronMan
sudo usermod -aG dialout Hulk

# 4. Set passwords
echo "IronMan:IronManPwd" | sudo chpasswd
echo "Hulk:HulkPwd" | sudo chpasswd

## ZSH Setting

Tomas# sudo chsh --shell "/usr/bin/zsh"
# or
Tomas# sudo vi /etc/password
# Find the row with Tomas and modify it like below line
Tomas:x:1002:1002::/home/earth/tomas:/usr/bin/zsh

Tomas# sudo vi ~/.zshrc
# Change the default theme
ZSH_THEME="obraun"

# Test it locally or reboot
ssh username@localhost

### Add alias in oh-my-zsh

Tomas# cat > ~/.oh-my-zsh/custom/alias.zsh << EOF
alias sysd='sudo -b unshare --pid --fork --mount-proc /lib/systemd/systemd --system-unit=basic.target;sudo -E nsenter --all -t $(pgrep -xo systemd) runuser -P -l $USER -c "exec $SHELL"'
# connect to minicom 0 ttyUSB0
alias com0="sudo minicom -t linux -D /dev/ttyUSB0"
# connect to minicom n with ttyUSBn where n=0 to 5
alias com0="minicom -t linux -D /dev/ttyUSB0"
alias com1="minicom -t linux -D /dev/ttyUSB1"
alias com2="minicom -t linux -D /dev/ttyUSB2"
alias com3="minicom -t linux -D /dev/ttyUSB3"
alias com4="minicom -t linux -D /dev/ttyUSB4"
alias com5="minicom -t linux -D /dev/ttyUSB5"

# disconnect to minicom n from ttyUSBn where n=0 to 5
alias kom0="sudo fuser -k /dev/ttyUSB0"
alias kom1="sudo fuser -k /dev/ttyUSB1"
alias kom2="sudo fuser -k /dev/ttyUSB2"
alias kom3="sudo fuser -k /dev/ttyUSB3"
alias kom4="sudo fuser -k /dev/ttyUSB4"
alias kom5="sudo fuser -k /dev/ttyUSB5"

nb='resize -s 54 154'
EOF

Tomas# source ~/.oh-my-zsh/oh-my-zsh.sh

## minicom

sudo minicom -t linux -D /dev/ttyUSB0

## Vim Plugins Install and Config
### 1. vim-fugitive
### 2. rainbow
### 3. lightline.vim
### 4. nerdtree
### 5. nerdcommenter
### 6. vim-solarized8
### 7. fzf
### 8. SrcExpl
### 9. Trinity
### 10. ctags
### 11. cscope

# Install vim-plug
Tomas# sudo curl -fLo ~/.vim/autoload/plug.vim --create-dirs \
    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim

Tomas# vi ~/.vimrc
# Add the function
call plug#begin('~/.vim/plugged')

# Add the plugins you want to install
Plug 'tpope/vim-fugitive'
Plug 'luochen1990/rainbow'
Plug 'itchyny/lightline.vim'
Plug 'preservim/nerdtree'
Plug 'preservim/nerdcommenter'
Plug 'lifepillar/vim-solarized8'
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'
Plug 'https://github.com/wesleyche/SrcExpl.git'
Plug 'https://github.com/wesleyche/Trinity.git'
call plug#end()

:source %
:PluginInstall

# Settings for all the plugins by adding below lines
" Plug 'junegunn/vim-easy-align'
" Plug 'https://github.com/junegunn/vim-github-dashboard.git'
"
"" Multiple Plug commands can be written in a single line using | separators
"Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
"
"" On-demand loading
"Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
"
"" Using a non-default branch
"Plug 'rdnetto/YCM-Generator', { 'branch': 'stable' }
"
"" Using a tagged release; wildcard allowed (requires git 1.9.2 or above)
"Plug 'fatih/vim-go', { 'tag': '*' }
"
"" Plugin options
"Plug 'nsf/gocode', { 'tag': 'v.20150303', 'rtp': 'vim' }
"
"" Unmanaged plugin (manually installed and updated)
"Plug '~/my-prototype-plugin'
"
" Initialize plugin system
call plug#end()

" for rainbow
let g:rainbow_active = 1 

" for lightline.vim' 
set laststatus=2
let g:lightline = {
      \ 'colorscheme': 'wombat',
      \ 'active': {
      \   'left': [ [ 'mode', 'paste' ],
      \             [ 'readonly', 'absolutepath', 'modified' ] ]
      \ },
      \ }

" for nerdtree
"autocmd VimEnter * NERDTree | wincmd p
"nnoremap <F9> :NERDTreeToggle<CR>
autocmd BufEnter * if tabpagenr('$') == 1 && winnr('$') == 1 && exists('b:NERDTree') && b:NERDTree.isTabTree() |
    \ quit | endif

" for nerdcommenter
let g:NERDSpaceDelims = 1
let g:NERDTrimTrailingWhitespace = 1

" for vim-solarized8
syntax enable
let g:solarized_termcolors=256
set background=dark
colorscheme solarized8

" for fzf
let g:fzf_action = {
            \ 'ctrl-t': 'tab split',
            \ 'ctrl-x': 'split',
            \ 'ctrl-v': 'vsplit' }

" Default fzf layout
" - down / up / left / right
let g:fzf_layout = { 'down': '~40%' }

" Customize fzf colors to match your color scheme
let g:fzf_colors =
            \ { 'fg':      ['fg', 'Normal'],
            \ 'bg':      ['bg', 'Normal'],
            \ 'hl':      ['fg', 'Comment'],
            \ 'fg+':     ['fg', 'CursorLine', 'CursorColumn', 'Normal'],
            \ 'bg+':     ['bg', 'CursorLine', 'CursorColumn'],
            \ 'hl+':     ['fg', 'Statement'],
            \ 'info':    ['fg', 'PreProc'],
            \ 'prompt':  ['fg', 'Conditional'],
            \ 'pointer': ['fg', 'Exception'],
            \ 'marker':  ['fg', 'Keyword'],
            \ 'spinner': ['fg', 'Label'],
            \ 'header':  ['fg', 'Comment'] }

" Enable per-command history.
" CTRL-N and CTRL-P will be automatically bound to next-history and
" previous-history instead of down and up. If you don't like the change,
" explicitly bind the keys to down and up in your $FZF_DEFAULT_OPTS.
let g:fzf_history_dir = '~/.local/share/fzf-history'
nnoremap <space>fl :Lines
nnoremap <space>fb :BLines
nnoremap <space>ff :Files
nnoremap <space>fg :GFiles
nnoremap <space>f? :GFiles?
nnoremap <space>ft :Tags<cr>
nnoremap <space>fa :Ag
nnoremap <space>fc :Commits


" for taglist
"nmap <F8> :TlistToggle<CR><CR>
set nocompatible
syntax on
set number
set cursorline
set ruler
set shiftwidth=4
set softtabstop=4
set tabstop=4
let Tlist_Show_One_File=1
let Tlist_Exit_OnlyWindow=1
set ut=100

" for SrcExpl
"nmap <F7> :SrcExplToggle<CR> 
" // Set the height of Source Explorer window 
let g:SrcExpl_winHeight = 8 
" // Set 100 ms for refreshing the Source Explorer 
let g:SrcExpl_refreshTime = 100 
" // Set "Enter" key to jump into the exact definition context 
let g:SrcExpl_jumpKey = "<ENTER>" 
" // Set "Space" key for back from the definition context 
let g:SrcExpl_gobackKey = "<SPACE>" 
" // In order to avoid conflicts, the Source Explorer should know what plugins except
" // itself are using buffers. And you need add their buffer names into below list
" // according to the command ":buffers!"
let g:SrcExpl_pluginList = [
        \ "__Tag_List__",
        \ "_NERD_tree_",
		\ "Source_Explorer"
    \ ]
" // The color schemes used by Source Explorer. There are five color schemes
" // supported for now - Red, Cyan, Green, Yellow and Magenta. Source Explorer
" // will pick up one of them randomly when initialization.
let g:SrcExpl_colorSchemeList = [
        \ "Red",
        \ "Cyan",
        \ "Green",
        \ "Yellow",
        \ "Magenta"
    \ ]
" // Enable/Disable the local definition searching, and note that this is not 
" // guaranteed to work, the Source Explorer doesn't check the syntax for now. 
" // It only searches for a match with the keyword according to command 'gd' 
let g:SrcExpl_searchLocalDef = 1 
" // Workaround for Vim bug @https://goo.gl/TLPK4K as any plugins using autocmd for
" // BufReadPre might have conflicts with Source Explorer. e.g. YCM, Syntastic etc.
" // Do not let the Source Explorer update the tags file when opening 
let g:SrcExpl_isUpdateTags = 0 
" // Use 'Exuberant Ctags' with '--sort=foldcase -R .' or '-L cscope.files' to 
" // create/update the tags file 
let g:SrcExpl_updateTagsCmd = "ctags --sort=foldcase -R ." 
" // Set "<F12>" key for updating the tags file artificially 
let g:SrcExpl_updateTagsKey = "<F12>" 
" // Set "<F3>" key for displaying the previous definition in the jump list 
let g:SrcExpl_prevDefKey = "<F3>" 
" // Set "<F4>" key for displaying the next definition in the jump list 
let g:SrcExpl_nextDefKey = "<F4>" 

" for trinity
" Open and close all the three plugins on the same time 
nmap <F8>  :TrinityToggleAll<CR> 

" Open and close the Source Explorer separately 
nmap <F9>  :TrinityToggleSourceExplorer<CR> 

" Open and close the Taglist separately 
nmap <F10> :TrinityToggleTagList<CR> 

" Open and close the NERD Tree separately 
nmap <F11> :TrinityToggleNERDTree<CR> 

nmap zs :cs find s <C-R>=expand("<cword>")<CR><CR>
nmap zg :cs find g <C-R>=expand("<cword>")<CR><CR>
nmap zc :cs find c <C-R>=expand("<cword>")<CR><CR>
nmap zt :cs find t <C-R>=expand("<cword>")<CR><CR>
nmap ze :cs find e <C-R>=expand("<cword>")<CR><CR>
nmap zf :cs find f <C-R>=expand("<cfile>")<CR><CR>
nmap zi :cs find i ^<C-R>=expand("<cfile>")<CR>$<CR>
nmap zd :cs find d <C-R>=expand("<cword>")<CR><CR>
Tomas# 

# Service Configuration
## Proxy settings
### Git

Tomas# cat >> ~/.gitconfig << EOF
[http]
        proxy = http://x.x.x.x:xxxx/
[https]
        proxy = https://x.x.x.x:xxxx/
EOF

### Apt

Tomas# sudo cat >> /etc/apt/apt.conf.d/proxy.conf << EOF
Acquire::http::Proxy "http://user:[e-mail]:port/";
Acquire::https::Proxy "http://user:[e-mail]:port/";
EOF

# Example
Tomas# sudo cat >> sudo /etc/apt/apt.conf.d/proxy.conf << EOF
Acquire::http::Proxy "http://x.x.x.x:xxxx/";
Acquire::https::Proxy "http://x.x.x.x:xxxx/";
EOF

### docker

Tomas# mkdir -p ~/.docker
Tomas# cat >> ~/.docker/config.json << EOF
{
 "proxies":
 {
   "default":
   {
     "httpProxy": "http://x.x.x.x:x",
     "httpsProxy": "https://x.x.x.x:x",
     "noProxy": "*.test.example.com,.example2.com,127.0.0.0/8"
   }
 }
}
EOF

### shell

Tomas# cat >> ~/.zshrc << EOF
export httpProxy="http://x.x.x.x:xxxx"
export httpsProxy=https://x.x.x.x:xxxx"
EOF

Tomas# source ~/.zshrc

### tftp server (tftpd-hpa)
#### Configuration

vim /etc/default/tftpd-hpa
TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/home/tftp"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="-l -c -s"

sudo mkdir /home/tftp
sudo chmod 777 -R /tftpboot
sudo chown nobody.nogroup -R /tftpboot
service tftpd-hpa restart
netstat -a | grep tftp

#### Usage

# Assume:
# - server ip: 192.168.2.100
# - client ip: 192.168.2.1   with tftpd version 5.2
# on client side:
Usage tftp [-4][-6][-v][-l][-m mode] [host[port]] [-c command]
tftp 192.168.2.100 -cv get file_from_server
tftp 192.168.2.100 -cv put file_in_client

# on server side
sudo systemctl status tftpd-hpa.service

## SSH Setting

Tomas# sudo vi /etc/ssh/sshd_config
# Unmark below line
#Port 22
#PasswordAuthentication  yes

Tomas# sudo service ssh restart
#or
Tomas# sudo /etc/init.d/ssh  restart

### SSH Proxyjump
#### Config

Tomas# vi ~/.ssh/config
# The stepping stone
Host jump
    Hostname 172.16.x.x
    User tom
    IdentityFile ~/.ssh/id_rsa_tom

# The target
Host target
    HostName 192.168.x.x
    User root
    IdentityFile ~/.ssh/id_rsa_target
    ProxyJump jump

#### Usage

Tomas# scp images/xxx.bin dut:/mnt/flash/
Tomas# ssh dut

### Troubleshooting
#### Sympton

Tomas# ssh tomas@local
The authenticity of host '<host>' can't be established.
ECDSA key fingerprint is    SHA256:TER0dEslggzS/BROmiE/s70WqcYy6bk52fs+MLTIptM.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'pc' (ECDSA) to the list of known hosts.

#### Solution

Tomas# cat >> ~/.ssh/config << EOF
# Don't listen yes/no.
StrictHostKeyChecking no
# Ignore "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!"
UserKnownHostsFile=/dev/null
EOF

## Telnet Setting

Tomas# sudo vi /etc/inetd.conf
# Add below line
telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd

Tomas# sudo vi /etc/xinetd.d/telnet
# Add below lines
service telnet
{
    disable = no
    flags = REUSE
    socket_type = stream
    wait = no
    user = root
    server = /usr/sbin/in.telnetd
    log_on_failure += USERID
}

# Restart service
sudo service xinetd restart

## Samba Setting

Tomas# sudo vi /etc/samba/smb.conf

# Add below lines:
[homes]
   comment = Home Directories
   browseable = yes
   read only = no
   create mask = 0644
   directory mask = 0755
   valid users = %S
   
[earths]
   comment = Public Directories
   path = /home/earth
   browseable = yes
   read only = no
   writable = yes
   create mask = 0644
   directory mask = 0755
   valid users = @Superhero

# Set passwords
echo -e "IronManPwd\nIronManPwd\n" | sudo smbpasswd -a -s IronMan
echo -e "HulkPwd\nHulkPwd\n" | sudo smbpasswd -a -s Hulk

# Restart service
sudo /etc/init.d/samba-ad-dc restart
sudo service smbd restart

## SFTP group/user Setting

1. Create the group and account

Tomas# sudo echo "/usr/sbin/nologin" >> /etc/shells
Tomas# sudo groupadd SFTP
Tomas# sudo useradd -m AntMan -G SFTP -s /usr/sbin/nologin -d /home/sftp/antman
Tomas# echo "AntMan:AntManPWD" | sudo chpasswd

2. Create a public folder for all users

Tomas# mkdir -p /home/sftp/public
Tomas# sudo mkdir -p /home/sftp/antman/public
Tomas# sudo chown AntMan:SFTP /home/sftp/antman/public
Tomas# sudo mount --bind /home/sftp/public /home/sftp/antman/public

Tomas# sudo vi /etc/fstab
# Add below line
/home/sftp/public /home/sftp/antman/public none defaults,bind 0 0

## Vsftpd Setting

Tomas# sudo vi /etc/ssh/sshd_config
Port 22
ClientAliveInterval 120
ClientAliveCountMax 5
Subsystem       sftp    internal-sftp
Match group sftp
ChrootDirectory /home/sftp/%u
ForceCommand internal-sftp
X11Forwarding no
AllowTcpForwarding no

# Start the service
Tomas# systemctl start sshd


Tomas# sudo vi /etc/vsftpd.conf
# Add/Modify below lines
listen=NO
listen_ipv6=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
chroot_local_user=YES
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
pasv_enable=Yes
pasv_min_port=10000
pasv_max_port=10100
allow_writeable_chroot=YES

ssl_enable=YES
ssl_tlsv1=YES
ssl_sslv2=NO
ssl_sslv3=NO
allow_anon_ssl=NO
force_local_data_ssl=YES
force_local_logins_ssl=YES
require_ssl_reuse=NO
ssl_ciphers=HIGH
debug_ssl=YES
connect_timeout=300
accept_timeout=300

# Start the service
Tomas# systemctl start vsftpd
Tomas# systemctl enable vsftpd

# Set ufw
Tomas# sudo ufw allow 22
Tomas# sudo ufw allow 445/tcp
Tomas# sudo ufw allow from any to any proto tcp port 10000:10100
Tomas# sudo systemctl start ufw
Tomas# sudo systemctl enable ufw
Tomas# sudo ufw enable
Tomas# sudo ufw status numbered

https://www.linuxquestions.org/questions/linux-newbie-8/create-a-public-directory-for-chroot-ftp-users-4175461164/

https://www.796t.com/article.php?id=134165

## Fail2ban Setting

Utilize fail2ban to prevent ssh service from brute-force attack. An IP will be banned forever if it fails over 10 times authentication.

Tomas# sudo vi /etc/fail2ban/jail.local

[sshd]
ignoreip = 192.168.10.1/24
enabled = true
port = 22
filter = sshd
logpath = /var/log/auth.log
maxretry = 10
bantime = -1

Tomas# sudo systemctl enable fail2ban
Tomas# sudo systemctl start fail2ban
Tomas# sudo fail2ban-client status

# Annex
## Vim Setting
{%gist 5e4cbac702e347bd455e9bf1b981fc9e %}

# Modify below script
Tomas# vi ~/.vimrc

## Tmux Setting
{%gist 1ce273fb8e1ed8e27e124eb288e94dd9 %}

# Modify below script
Tomas# vi ~/.tmux.conf
Tomas# tmux source-file ~/.tmux.conf

## Tmux Session Save and Restore Setting

It is more convenient to use the TPM plugin **"[tmux-resurrect](https://github.com/tmux-plugins/tmux-resurrect)"**.
- prefix + ctrl + s to save tmux env setting.
- prefix + ctrl + r to restore saved tmux env setting.

{%gist a69fb3ca236108fbb58bedfa51bb6f14 %}

# 1. Create below script
Tomas# vi tmux-ssesion

# 2. Schedule it by crontab
Tomas# crontab -u tomas -e
*/30 * * * * /home/earth/tomas/tmux-session save
@reboot /home/earth/tomas/tmux-session restore

## Cscope Setting

{%gist 558f12443653b10a0f8fdb3869e00e2f %}

# 1. Create below script
Tomas# vi cscope.sh

# 2. Change mod
Tomas# sudo chmod +x cscope.sh

# 3. Copy this script to your source code or project directory
Tomas# cp cscope.sh project/

## git setting

### git server

Tomas# sudo adduser git
Tomas# su git
git# cd ~
git# mkdir .ssh && chmod 700 .ssh
git# touch .ssh/authorized_keys && chmod 600 .ssh/authorized_keys
git# mkdir -p git_repo/project.git
git# cd git_repo/project.git
git# git init --bare

## git client

Tomas# git config --global core.editor vim
Tomas# git config --global user.name <username>
Tomas# git config --global user.email <mailaddress>

Tomas# git clone git@192.168.1.100:~/git_repo/project.git
Cloning into 'project'...
Tomas# @localhost's password:
warning: You appear to have cloned an empty repository.

### Add authorized keys to git server for clients
The purpose is to skip entering password when doing git clone.

Tomas# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/tomas/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/tomas/.ssh/id_rsa
Your public key has been saved in /home/tomas/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:MGU98NrDN0Zl3nQjBZM9q4lBVc3ZbQexT3yKUYq96i4 tomas@T1-1-1-Q-60886
The key's randomart image is:
+---[RSA 3072]----+
|         o++==o  |
|        o   += o |
|         . .... o|
|         .o +. . |
|        So++..E  |
|       ...=*.  . |
|    . + oo**.    |
|     + +o%o.o    |
|    . ..+.*+     |
+----[SHA256]-----+

Tomas# cat ~/.ssh/id_rsa.pub
ssh-rsa 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 Tomas@build-server

Tomas# su git
git# cat >> ~/.ssh/authorized_keys << EOF
> 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 Tomas@build-server
> EOF

## Lazyvim
### Install
https://www.lazyvim.org/installation

### Troubleshooting
**nvim-treesitter Error during download, please verify your internet connection**
https://github.com/nvim-treesitter/nvim-treesitter/issues/3232

### Usage
https://github.com/bryant-video/neovim-tutorial/tree/main

https://www.youtube.com/watch?v=c5icE_ZxMzQ

https://www.youtube.com/watch?v=Wh2Uh3g5fOM
https://www.lazyvim.org/
https://github.com/folke/lazy.nvim?tab=readme-ov-file

## Nerd fonts
### Install on ubuntu

#!/bin/bash

declare -a fonts=(
    BitstreamVeraSansMono
    CodeNewRoman
    DroidSansMono
    FiraCode
    FiraMono
    Go-Mono
    Hack
    Hermit
    JetBrainsMono
    Meslo
    Noto
    Overpass
    ProggyClean
    RobotoMono
    SourceCodePro
    SpaceMono
    Ubuntu
    UbuntuMono
)

version='2.1.0'
fonts_dir="${HOME}/.local/share/fonts"

if [[ ! -d "$fonts_dir" ]]; then
    mkdir -p "$fonts_dir"
fi

for font in "${fonts[@]}"; do
    zip_file="${font}.zip"
    download_url="https://github.com/ryanoasis/nerd-fonts/releases/download/v${version}/${zip_file}"
    echo "Downloading $download_url"
    wget "$download_url"
    unzip "$zip_file" -d "$fonts_dir"
    rm "$zip_file"
done

find "$fonts_dir" -name '*Windows Compatible*' -delete

fc-cache -fv

https://gist.github.com/matthewjberger/7dd7e079f282f8138a9dc3b045ebefa0

## Remote access of Raspberry Pi desktop
Connect from Windows Remote Desktop Client.

sudo apt update
sudo apt upgrade
sudo apt install xrdp
sudo systemctl status xrdp
sudo systemctl start xrdp

https://www.youtube.com/watch?v=T8ZOZZKsb_c

## Windterm
### Modify fonts
1. Open windterm-install-path/global/themes/dige-black/scheme.theme
2. Add your font name in fontFamily of "text.default" session as shown below

{
	"name": "text.default",
	"style": {
		"foreground": "#F8F8F2",
		"background": "#1c1c1c",
		"fontFamily": "Roboto Mono, Fira Code Retina, Lucida Sans Typewriter, Lucida Console, Monoca, 3270NerdFontMono",
		"fontSize": 10
	}
}

https://github.com/kingToolbox/WindTerm/issues/148

### Install on Windows
1. Download the fonts you want
https://www.nerdfonts.com/font-downloads
2. Unzip it
3. Select all the fonts and install

# Reference
https://www.tecmint.com/install-ftp-server-in-ubuntu/
https://www.tecmint.com/secure-ftp-server-using-ssl-tls-on-ubuntu/
http://nickinwork.blogspot.com/2013/10/ubuntu-telnet-server-ssh-server.html
https://phoenixnap.com/kb/how-to-add-user-to-group-linux
https://sites.google.com/site/linuxcooltea/home/ubuntu-she-dingssh-yuan-duan-lian-xian-gong-neng
https://github.com/ohmyzsh/ohmyzsh/tree/6fbad5bf72fad4ecf30ba4d4ffee62bac582f0ed

https://blog.gtwang.org/linux/linux-crontab-cron-job-tutorial-and-examples/
https://superuser.com/questions/440015/restore-tmux-session-after-reboot
https://www.cyberciti.biz/faq/how-to-delete-a-ufw-firewall-rule-on-ubuntu-debian-linux/
https://www.linuxquestions.org/questions/linux-newbie-8/create-a-public-directory-for-chroot-ftp-users-4175461164/
https://stackoverflow.com/questions/3663895/ssh-the-authenticity-of-host-hostname-cant-be-established
https://cmdref.net/os/linux/user/ssh.html
https://medium.com/@nutanbhogendrasharma/setup-git-repository-in-ubuntu-20-04-vps-864f784ecab1
https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-set-the-proxy-for-apt-for-ubuntu-18-04/
https://docs.docker.com/network/proxy
https://medium.com/starbugs/tpm-%E5%A5%97%E4%BB%B6%E7%AE%A1%E7%90%86%E5%B7%A5%E5%85%B7-%E8%AE%93%E4%BD%A0%E7%9A%84-tmux-%E6%9B%B4%E5%A5%BD%E7%94%A8-95ecd924c9d
https://github.com/tmux-plugins/tmux-resurrect