~$ sudo apt-get update
~$ sudo apt install golang-go
~$ go version
  go version go1.18.1

~$ sudo apt update
~$ sudo apt -y install hugo
~$ hugo version
  hugo v0.92.2

package main

import "fmt"

func main() {
  message := greetMe("world")
  fmt.Println(message)
}

func greetMe(name string) string {
  return "Hello, " + name + "!"
}

$ go run hello.go

var msg string
msg = "Hello"

msg := "Hello"

const Phi = 1.618

if day == "sunday" || day == "saturday" {
  rest()
} else if day == "monday" && isTired() {
  groan()
} else {
  work()
}

if _, err := doThing(); err != nil {
  fmt.Println("Uh oh")

switch day {
  case "sunday":
    // cases don't "fall through" by default!
    fallthrough

  case "saturday":
    rest()

  default:
    work()
}

for count := 0; count <= 10; count++ {
  fmt.Println("My counter is at", count)
}

entry := []string{"Misaki","Taro","Hanako"}
for i, val := range entry {
  fmt.Printf("At position %d, the character %s is present\n", i, val)

n := 0
x := 42
for n != x {
  n := guess()
}

str := "Hello"

str := `Multiline
string`

num := 3          // int
num := 3.         // float64
num := 3 + 4i     // complex128
num := byte('a')  // byte (alias for uint8)

var u uint = 7        // uint (unsigned)
var p float32 = 22.7  // 32-bit float

// var numbers [5]int
numbers := [...]int{0, 0, 0, 0, 0}

i := 2
f := float64(i)
u := uint(i)

slice := []int{2, 3, 4}

slice := []byte("Hello")

if day == "sunday" || day == "saturday" {
  rest()
} else if day == "monday" && isTired() {
  groan()
} else {
  work()
}

if _, err := doThing(); err != nil {
  fmt.Println("う～ん！")

NAME="Misaki"
echo $NAME
echo "$NAME"
echo "${NAME}

if [[ -z "$string" ]]; then
  echo "String is empty"
elif [[ -n "$string" ]]; then
  echo "String is not empty"
fi

alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

alias cl='clear'

# Nodenv
export PATH="$HOME/.nodenv/bin:$PATH"
eval "$(nodenv init -)"

# VSCode
export PATH=$PATH:"/mnt/c/Program Files/Microsoft VS Code/bin"

# export PATH=$PATH:"/mnt/c/Users/ユーザー名/AppData/Local/Programs/Microsoft VS Code/bin"
export PATH=$PATH:"/mnt/c/Program Files/Microsoft VS Code/bin"

/#SSHの確認
$ dpkg -l | grep ssh
ii  libssh-4:amd64                       0.9.3-2ubuntu2.2                      amd64        tiny C SSH library (OpenSSL flavor)
ii  openssh-client                       1:8.2p1-4ubuntu0.3                    amd64        secure shell (SSH) client, for secure access to remote machines
ii  openssh-server                       1:8.2p1-4ubuntu0.3                    amd64        secure shell (SSH) server, for secure access from remote machines
ii  openssh-sftp-server                  1:8.2p1-4ubuntu0.3                    amd64        secure shell (SSH) sftp server module, for SFTP access from remote machines
ii  ssh-import-id                        5.10-0ubuntu1                         all          securely retrieve an SSH public key and install it locally

/# gitのバージョン管理
$ git --version
git version 2.33.1

  /#　秘密鍵と公開鍵の生成
  matsu@hpPC:~$ mkdir .ssh
  matsu@hpPC:~$ cd .ssh
 $ ssh-keygen -t ed25519 -C "tech@raizi.net"
  Generating public/private ed25519 key pair.
  Enter file in which to save the key (/home/matsu/.ssh/id_ed25519): TechRZN
  Enter passphrase (empty for no passphrase): adminDE_s0
  Enter same passphrase again: adminDE_s0
  Your identification has been saved in TechRZN
  Your public key has been saved in TechRZN.pub
  The key fingerprint is:
  SHA256:cYVWSjEwdVkEdfWnY1KJgHDdDKKmN1Xcz2/5lfBNuV8 tech@raizi.net
  The key's randomart image is:
  +--[ED25519 256]--+
  |      ..=*OO=*+ +|
  |       o.==*=. o.|
  |      o o.o .oo +|
  |     o . o   oooo|
  |    . o S   . *o=|
  |     . .     o *E|
  |               .=|
  |                o|
  |                 |
  +

  $ cat TechRZN.pub
  ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGmRI9AbSL7H6jRINzqGB9rFXQUENt+PMl/idf1m7ZGz tech@raizi.net

/#接続テスト
$ ssh -T git@github.com 
The authenticity of host 'github.com (52.192.72.89)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'github.com,52.192.72.89' (RSA) to the list of known hosts.
Hi TechRZN! You've successfully authenticated, but GitHub does not provide shell access.

#パッケージのインストール
install.packages("plumber", dependencies = T)

#パッケージの読み込み
library("plumber")

0x03A0   Π
0x03A1   Ρ
0x03A3   Σ
0x03A4   Τ
0x03A5   Υ
0x03A6   Φ
0x03A7   Χ
0x03A8   Ψ
0x03A9   Ω
0x03B1   α
0x03B2   β
0x03B3   γ
0x03B4   δ
0x03B5   ε
0x03B6   ζ
0x03B7   η
0x03B8   θ
0x03B9   ι
0x03BA   κ
0x03BB   λ
0x03BC   μ
0x03BD   ν
0x03BE   ξ
0x03BF   ο
0x03C0   π
0x03C1   ρ
0x03C3   σ
0x03C4   τ
0x03C5   υ
0x03C6   φ
0x03C7   χ
0x03C8   ψ
0x03C9   ω
0x0401   Ё

#パッケージのインストール
install.packages("luzlogr")

#パッケージの読み込み
library("luzlogr")
 
#作業ディレクトリにlogファイルを作成:openlogコマンド
logfile <- openlog("test.log")
 
#logファイルにメッセージを書き込み:printlogコマンド
printlog("メッセージ")
printlog(2*3)
 
#logファイルに書き込みを終了:closelogコマンド
#セッション情報を書き込む:sessionInfoオプション;TRUE/FALSE
closelog(sessionInfo = TRUE)

# 確認
getwd()
# 作業ディレクトリの位置の変更は、RStudioのメニューバーから、
#「Session」→「Set Working Directory」→「Choose Directory」で変更できます。
setwd("~/<dirctory>")

# ログディレクトリへ移動し調べます。
  cd /var/log/shiny-server
  ls -al

  rmd-shiny-20220830-034118-32877.log    rmd-shiny-20220830-112101-37013.log     sms-shiny-shiny-20220903-023934-38343.log

  sudo cat 
  Error in library(httr) : there is no package called ‘httr’
  Calls: runApp ... sourceUTF8 -> eval -> eval -> ..stacktraceon.. -> library
  Execution halted

# library(httr) がないのでエラーが出ています。
# ユーザーrstudioでは、動くのですがユーザーshinyでは動きませんので追加します。
# ユーザーshinyになってhomeディレクトリに移動します。

  su - shiny
  $ pwd
  /home/shiny

# httrをインストールします。

  R
  > install.packages("httr")
  > The downloaded source packages are in
          ‘/tmp/RtmpGAUDSy/downloaded_packages’

install_github('ramnathv/rCharts')
# 以下のようにinstall_githubが使えるようにします。
   library(remotes)
   install_github('ramnathv/rCharts')