ntamvl

How to install gem idn-ruby

Ubuntu*

$ sudo apt -y install libidn11-dev
$ gem install idn-ruby  # Rails で使用する場合はプロジェクトディレクトリ内で bundle install

macOS

ntamvl

First, install latest Ruby Example:

rbenv install 2.6.0
rbenv global 2.6.0
rbenv rehash

After that I redid the following:

ntamvl

Install Squid proxy server on Ubuntu 14.04

Installing Squid

Squid is available in the Ubuntu repositories. To ensure your system is up to date and then to install Squid, run the following commands:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install squid

Copy the original configuration file to keep as a backup:

ntamvl

OS X Terminal color prompt

Update .bash_profile with content:

export CLICOLOR=1
export PS1="\[\e[36m\]\w\[\e[0m\]$ "
alias ll='ls -GFhl' dir='ls -GFhl'
alias start=open
printf "\033]0;`date "+%a %d %b %Y %I:%M %p"`\007"

ntamvl

Compress multiple folders, each into its own zip archive

for i in */; do tar -czvf "${i%/}.tar.gz" "$i"; done

Example:

for i in */; do 

ntamvl

How To Secure Nginx with Let's Encrypt on Ubuntu 16.04

Step 1 — Installing Certbot

First, add the repository.

sudo add-apt-repository ppa:certbot/certbot

You'll need to press ENTER to accept. Then, update the package list to pick up the new repository's package information.

sudo apt-get update

ntamvl

On macOS Mojave, rbenv install 2.6.1 hangs at "use realline from homebrew"

First install readline from homebrew

brew install readline
brew link --force readline

This fixed it for me:

ntamvl

Remove all node_module folders recursively

find . -name "node_modules" -exec rm -rf '{}' +

That will delete the folder and files even if there is a space in the name.

That saved me about 10GB over several hundred node projects which I had not touched in a while. If I need the node modules back, I can simply run npm install

ntamvl

Systemd Service for homebridge on Raspberry Pi

Check location of homebridge

pi@raspberrypi:~/.homebridge $ which homebridge
/usr/bin/homebridge

Create file /etc/systemd/system/homebridge.service

ntamvl

Ubuntu 16 – how to increase maximum file open limit ( ulimit -n )

If you are setting up nginx,chances are you will discover your worker_connections is at some low number, such as 1024. You can’t increase this number unless you increase kernel limit as well. First of all run cat /proc/sys/fs/file-max to discover your maximum limit.

abc@ubuntu:~$ cat /proc/sys/fs/file-max
1048576
abc@ubuntu:~$ ulimit -n
1024