DEV Community: Ko Takagi

How to convert DVD to mp4 with ffmpeg

Ko Takagi — Sat, 17 Apr 2021 12:43:56 +0000

I'll write it down how to convert DVD to mov with ffmpeg as a reminder.✍️

Install ffmpeg

brew install ffmpeg

How to convert

Browse for the DVD files in the Finder and get the .vob file name you want to convert.

For example, if you want to convert a file named VTS_01_1.VOB.

ffmpeg -i VTS_01_1.VOB -b:v 1500k -r 30 -vcodec h264 -strict -2 -acodec aac -ar 44100 -f mp4 convert.mp4

For example, you want to combine and convert the files VTS_01_1.VOB, VTS_01_1.VOB, and VTS_01_1.VOB.

ffmpeg -i "concat:VTS_01_1.VOB|VTS_01_2.VOB|VTS_01_3.VOB" -b:v 1500k -r 30 -vcodec h264 -strict -2 -acodec aac -ar 44100 -f mp4 convert.mp4

Great!👍

My first review of a standing desk🧍🖥️

Ko Takagi — Thu, 24 Dec 2020 15:55:03 +0000

It's been over 6 months since I first started working with a standing desk.

Here is a review of what I thought.

Why I started using it 🤔

I've been working from home every day since the coronavirus happend, and my back has been gradually hurting because of all the sitting I do.

I read a book called "The Healthy Programmer", which says that sitting all the time is not good for the human body.

So, I decided to try to use a standing desk.

What I bought it 🛒

I bought the following.

Fenge SD315001WB Standing Desk

It's a desk top type, so I can use the same desk I've been using.

The height of the desk can be raised and lowered by the gas pressure method. It is easy to operate as all you have to do is raise the lever on the side.

This is a view of the laptop (Macbook Pro 13inch), display (P2720DC), keyboard and mouse in place. It's pretty crowded, but it's stable and there's no problem to use it.

Here is a shot of me working in the environment. It's quite good.

My impressions 💭

Here are some of the good and bad points I have found in using it so far.

Good for a change of pace 🙆

When I get bored or sleepy, I can instantly switch to the standing position.

It's good for a change of pace.

My back pain has decreased 😀

I noticed that my back pain has been decreasing.

I don't have any evidence, but maybe I spent less time sitting, which reduced the strain on my back.

My legs become painful 😓

If I work standing for a long time, my feet will become very sore.

I need to try not to use it for too long, or utilize the goods described below to reduce the burden on my legs.

It's pretty tiring 💦

I'm just standing there, but I'm more tired than I thought I would be.

When I do standing work for many hours a day, my body gets wrapped up in fatigue in the evening and I fall asleep early at night.

I think that might be enough exercise for me.

Items I use with the standing desk ⚙️

slippers 👟

I bought a pair of slippers with a cushion. This may have the effect of reducing the strain on my feet.

balance board 🟤

I bought this balance board from Amazon.

I feel that my body balance and posture will improve when I work while riding the balance board. It is very tiring though, so I use it sometimes.

massage ball 🎾

I have been loving these massage balls lately.

I put this on the floor and roll it around on the soles of my feet as I work. It feels really good and makes my feet feel better than just standing there.

The end 🏁

This is cost effective and I think I made a good purchase👍

In the future, I would like to measure the effects of standing discs on the body. I'm not sure the specifics of how to do that, so if you have any good ideas, please let me know😅

How to print a WooCommerce order with a kitchen receipt printer

Ko Takagi — Fri, 16 Oct 2020 13:58:53 +0000

I printed the orders I received on WooCommerce to the kitchen receipt printer.

The environment I used is as follows.

H/W
- mC-Print3 MCP31LB BK
S/W
- WooCommerce
- Star CloudPRNT for WooCommerce

Setup

View your WordPress site with WooCommerce installed.

Install and activate Star CloudPRNT for WooCommerce from the WordPress admin screen.

Open [Settings] > [Star CloudPRNT for WooCommerce Settings], and copy [Server URL].

Open the printer settings screen of mC-Print3. Then, go to the [CloudPRNT] setting screen and enter the [CloudPRNT Service], [Server URL] and [Polling time] fields.

By the way, paste the URL copied by WordPress into the [Server URL] field.

Back to WordPress admin screen, then open [Star CloudPRNT for WooCommerce Settings].

Once you select ENABLE for field [CloudPRNT] and select your printer for field [Selected Printer], save it.

Now you are ready to go.

Try

Let's try it out and order something from WooCommerce.

The receipt should be printed from the printer as shown in the following video.

Have fun!👍

Note

In the demo in the video above, I wanted to change the text to be printed to another language, so I created an alternative plugin.

ko31/star-cloudprnt-for-woocommerce-plus: This is a plugin that extends Star CloudPRNT for WooCommerce

If you want to do what I did, try this plugin instead of Star CloudPRNT for WooCommerce.

Setup PHP development environment width LDAP

Ko Takagi — Sun, 04 Oct 2020 08:07:21 +0000

I have created a system to authenticate LDAP from PHP before.

At that time, I created a development environment with Docker, so I'll make a note of how to set it up.

The environment I used is as follows.

macOS Catalina 10.15.5
Git
Docker Desktop for Mac

How to setup

open a terminal and clone LAMP+OpenLDAP Dev Docker repository.

git clone https://github.com/ko31/lamp-dev-docker.git <your-project-name>

Create and start containers.

cd <my-project-name>
docker-compose up -d

Then, you can access your local website at http://localhost:8000
(The document root is the <your-project-name>/www/html directory.)

Try connecting to LDAP from PHP

To begin, make sure you have users connecting to your LDAP server.

Open phpLDAPadmin at http://localhost:8888 and click login.

In this container, the Login DN is cn=admin,dc=example,dc=com and the Password is password by default. Input it and click authenticate.

You can see that you were able to logged as an admin user.

Create <your-project-name>/www/html/connect.php and put the following:

<?php
// LDAP settings
const LDAP_HOST = "ldap-host";
const LDAP_PORT = 389;
const LDAP_DC = "dc=example,dc=com";
const LDAP_CN = "admin";
const LDAP_PASS = "password";

// Connect LDAP server.
$ldap_conn = ldap_connect(LDAP_HOST, LDAP_PORT);
if (!$ldap_conn) {
    exit('Could not connect to LDAP server.');
}

// Switch protocol to LDAPv3.
ldap_set_option($ldap_conn, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_set_option($ldap_conn, LDAP_OPT_REFERRALS, 0);

// Bind to LDAP directory.
$ldap_dn = 'cn=' . LDAP_CN . ',' . LDAP_DC;
$ldap_bind = ldap_bind($ldap_conn, $ldap_dn ,LDAP_PASS);
if ($ldap_bind) {
    exit('LDAP bind successful..');
} else {
    exit('LDAP bind failed.');
}

You can confirm a successful connection at http://localhost:8000/connect.php

Have fun!👍

How to setup Golang with VSCode

Ko Takagi — Mon, 21 Sep 2020 07:08:10 +0000

I have used Golang some years ago, but unfortunately I hadn't tried to do it in a long time and had forgotten all about it....

So I set it up from the beginning with a fresh mind.😊

The environment I used is as follows.

macOS Catalina 10.15.5
Visual Studio Code 1.46.1

Installing Go

Download and install Go from the following link.

Downloads - The Go Programming Language

After the installation, open a terminal and check the version using the following command.



$ go version
go version go1.15.2 darwin/amd64

Create directory for GOPATH setting.



$ mkdir ~/go

For GOPATH envirionment variable, add the following lines to the ~/.bash_profile.



export GOPATH=$HOME/go
export PATH=$GOPATH/bin:$PATH

Installing Visual Studio Code

Download and install VSCode from the following link.

Download Visual Studio Code - Mac, Linux, Windows

After the installation, Launch VSCode.

Open the Extensions Marketplace (Cmd+Shift+X), search Go and install it.

open the Command Palette (Cmd+Shift+P) and run the Go: Install/Update Tools command.

Install all the Go extensions listed there.

Start coding

Create hello.go in VSCode.



package main

import "fmt"

func main() {
    fmt.Println("Hello, world!")
}

By default, auto-completion and formatting for code saving are enabled. That's great.

Open a terminal (Ctrl+`) and execute the following command.



$ go run hello.go 
Hello, world!

Have fun!👍

How to bulk delete huge post data in WordPress

Ko Takagi — Fri, 14 Aug 2020 02:03:26 +0000

That's a lot of work, deleting hundreds of thousands of huge post data.

Let's use the WP-CLI command to delete all those data at once.

How to use

Bulk delete all post data.

wp post delete $(wp post list --post_type='post' --format=ids) --force

If you want to delete data from your custom post type, you can specify the post type in the post_type option

# Delete post type 'news'
wp post delete $(wp post list --post_type='news' --format=ids) --force

If you have too much data to delete, you may get an Argument list too long error.

In that case, you can delete it little by little with a shell script like the following.

#!/bin/sh

# Deleting 10,000 at a time.
for i in `seq 1 10`
do
    wp post delete $(wp post list --post_type='your-post-type' --format=ids --posts_per_page=10000) --force
done

echo "done"

Using Imagemagick to easily split an image file

Ko Takagi — Fri, 19 Jun 2020 01:12:08 +0000

convert command of ImageMagick is very useful to split an images file.

To use the convert, you'll need to install ImageMagick beforehand.

brew install imagemagick

Split the image to the left and right

input.png

convert -crop 50%x100% input.png output.png

output-0.png

output-1.png

Split the image to the top and bottom

input.png

convert -crop 100%x50% input.png output.png

output-0.png

output-1.png

Split the image into 4 parts

input.png

convert -crop 50%x50% input.png output.png

output-0.png

output-1.png

output-2.png

output-3.png

Return value of get_queried_object() in WordPress

Ko Takagi — Mon, 16 Mar 2020 02:44:53 +0000

I checked what kind of return value of get_queried_object() depends on the page type.

WordPress 5.3.2

Homepage

NULL

Front page

NULL

Single post

object(WP_Post)#4808 (24) {
  ["ID"]=>
  int(1)
  ["post_author"]=>
  string(1) "1"
  ["post_date"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_date_gmt"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_content"]=>
  string(137) "
Welcome to WordPress. This is your first post. Edit or delete it, then start writing!


"
  ["post_title"]=>
  string(12) "Hello world!"
  ["post_excerpt"]=>
  string(0) ""
  ["post_status"]=>
  string(7) "publish"
  ["comment_status"]=>
  string(4) "open"
  ["ping_status"]=>
  string(4) "open"
  ["post_password"]=>
  string(0) ""
  ["post_name"]=>
  string(11) "hello-world"
  ["to_ping"]=>
  string(0) ""
  ["pinged"]=>
  string(0) ""
  ["post_modified"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_modified_gmt"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_content_filtered"]=>
  string(0) ""
  ["post_parent"]=>
  int(0)
  ["guid"]=>
  string(22) "http://work.local/?p=1"
  ["menu_order"]=>
  int(0)
  ["post_type"]=>
  string(4) "post"
  ["post_mime_type"]=>
  string(0) ""
  ["comment_count"]=>
  string(1) "1"
  ["filter"]=>
  string(3) "raw"
}

Single page

object(WP_Post)#366 (24) {
  ["ID"]=>
  int(2)
  ["post_author"]=>
  string(1) "1"
  ["post_date"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_date_gmt"]=>
  string(19) "2019-12-16 12:48:44"
  ["post_content"]=>
  string(76) "
This is an example page.


"
  ["post_title"]=>
  string(11) "Sample Page"
  ["post_excerpt"]=>
  string(0) ""
  ["post_status"]=>
  string(7) "publish"
  ["comment_status"]=>
  string(6) "closed"
  ["ping_status"]=>
  string(4) "open"
  ["post_password"]=>
  string(0) ""
  ["post_name"]=>
  string(11) "sample-page"
  ["to_ping"]=>
  string(0) ""
  ["pinged"]=>
  string(0) ""
  ["post_modified"]=>
  string(19) "2020-03-16 10:53:03"
  ["post_modified_gmt"]=>
  string(19) "2020-03-16 01:53:03"
  ["post_content_filtered"]=>
  string(0) ""
  ["post_parent"]=>
  int(0)
  ["guid"]=>
  string(28) "http://work.local/?page_id=2"
  ["menu_order"]=>
  int(0)
  ["post_type"]=>
  string(4) "page"
  ["post_mime_type"]=>
  string(0) ""
  ["comment_count"]=>
  string(1) "0"
  ["filter"]=>
  string(3) "raw"
}

Category archive

object(WP_Term)#4828 (16) {
  ["term_id"]=>
  int(1)
  ["name"]=>
  string(4) "News"
  ["slug"]=>
  string(4) "news"
  ["term_group"]=>
  int(0)
  ["term_taxonomy_id"]=>
  int(1)
  ["taxonomy"]=>
  string(8) "category"
  ["description"]=>
  string(0) ""
  ["parent"]=>
  int(0)
  ["count"]=>
  int(1)
  ["filter"]=>
  string(3) "raw"
  ["cat_ID"]=>
  int(1)
  ["category_count"]=>
  int(1)
  ["category_description"]=>
  string(0) ""
  ["cat_name"]=>
  string(4) "News"
  ["category_nicename"]=>
  string(4) "news"
  ["category_parent"]=>
  int(0)
}

Tag archive

object(WP_Term)#4818 (10) {
  ["term_id"]=>
  int(7)
  ["name"]=>
  string(12) "サンプル"
  ["slug"]=>
  string(6) "sample"
  ["term_group"]=>
  int(0)
  ["term_taxonomy_id"]=>
  int(7)
  ["taxonomy"]=>
  string(8) "post_tag"
  ["description"]=>
  string(0) ""
  ["parent"]=>
  int(0)
  ["count"]=>
  int(1)
  ["filter"]=>
  string(3) "raw"
}

Taxonomy archive

object(WP_Term)#4824 (10) {
  ["term_id"]=>
  int(8)
  ["name"]=>
  string(4) "pops"
  ["slug"]=>
  string(4) "pops"
  ["term_group"]=>
  int(0)
  ["term_taxonomy_id"]=>
  int(8)
  ["taxonomy"]=>
  string(5) "genre"
  ["description"]=>
  string(0) ""
  ["parent"]=>
  int(0)
  ["count"]=>
  int(1)
  ["filter"]=>
  string(3) "raw"
}

Custom post archive

object(WP_Post_Type)#419 (30) {
  ["name"]=>
  string(7) "product"
  ["label"]=>
  string(8) "Products"
  ["labels"]=>
  object(stdClass)#416 (32) {
    ["name"]=>
    string(8) "Products"
    ["singular_name"]=>
    string(7) "Product"
    ["add_new"]=>
    string(11) "New Product"
    ["add_new_item"]=>
    string(15) "Add New Product"
    ["edit_item"]=>
    string(12) "Edit Product"
    ["new_item"]=>
    string(8) "New Item"
    ["view_item"]=>
    string(12) "View Product"
    ["view_items"]=>
    string(10) "View Items"
    ["search_items"]=>
    string(15) "Search products"
    ["not_found"]=>
    string(17) "No products found"
    ["not_found_in_trash"]=>
    string(26) "No products found in Trash"
    ["parent_item_colon"]=>
    string(15) "Parent Product:"
    ["all_items"]=>
    string(12) "All Products"
    ["archives"]=>
    string(13) "Item Archives"
    ["attributes"]=>
    string(15) "Item Attributes"
    ["insert_into_item"]=>
    string(16) "Insert into item"
    ["uploaded_to_this_item"]=>
    string(21) "Uploaded to this item"
    ["featured_image"]=>
    string(14) "Featured Image"
    ["set_featured_image"]=>
    string(18) "Set featured image"
    ["remove_featured_image"]=>
    string(21) "Remove featured image"
    ["use_featured_image"]=>
    string(21) "Use as featured image"
    ["filter_items_list"]=>
    string(17) "Filter items list"
    ["items_list_navigation"]=>
    string(21) "Items list navigation"
    ["items_list"]=>
    string(10) "Items list"
    ["item_published"]=>
    string(15) "Post published."
    ["item_published_privately"]=>
    string(25) "Post published privately."
    ["item_reverted_to_draft"]=>
    string(23) "Post reverted to draft."
    ["item_scheduled"]=>
    string(15) "Post scheduled."
    ["item_updated"]=>
    string(13) "Post updated."
    ["menu_name"]=>
    string(8) "Products"
    ["name_admin_bar"]=>
    string(7) "Product"
    ["update_item"]=>
    string(14) "Update Product"
  }
  ["description"]=>
  string(26) "Product information pages."
  ["public"]=>
  bool(true)
  ["hierarchical"]=>
  bool(false)
  ["exclude_from_search"]=>
  bool(false)
  ["publicly_queryable"]=>
  bool(true)
  ["show_ui"]=>
  bool(true)
  ["show_in_menu"]=>
  bool(true)
  ["show_in_nav_menus"]=>
  bool(true)
  ["show_in_admin_bar"]=>
  bool(true)
  ["menu_position"]=>
  int(5)
  ["menu_icon"]=>
  NULL
  ["capability_type"]=>
  string(4) "page"
  ["map_meta_cap"]=>
  bool(true)
  ["register_meta_box_cb"]=>
  NULL
  ["taxonomies"]=>
  array(1) {
    [0]=>
    string(5) "genre"
  }
  ["has_archive"]=>
  bool(true)
  ["query_var"]=>
  string(7) "product"
  ["can_export"]=>
  bool(true)
  ["delete_with_user"]=>
  NULL
  ["_builtin"]=>
  bool(false)
  ["_edit_link"]=>
  string(16) "post.php?post=%d"
  ["cap"]=>
  object(stdClass)#424 (15) {
    ["edit_post"]=>
    string(9) "edit_page"
    ["read_post"]=>
    string(9) "read_page"
    ["delete_post"]=>
    string(11) "delete_page"
    ["edit_posts"]=>
    string(10) "edit_pages"
    ["edit_others_posts"]=>
    string(17) "edit_others_pages"
    ["publish_posts"]=>
    string(13) "publish_pages"
    ["read_private_posts"]=>
    string(18) "read_private_pages"
    ["read"]=>
    string(4) "read"
    ["delete_posts"]=>
    string(12) "delete_pages"
    ["delete_private_posts"]=>
    string(20) "delete_private_pages"
    ["delete_published_posts"]=>
    string(22) "delete_published_pages"
    ["delete_others_posts"]=>
    string(19) "delete_others_pages"
    ["edit_private_posts"]=>
    string(18) "edit_private_pages"
    ["edit_published_posts"]=>
    string(20) "edit_published_pages"
    ["create_posts"]=>
    string(10) "edit_pages"
  }
  ["rewrite"]=>
  array(5) {
    ["slug"]=>
    string(7) "product"
    ["with_front"]=>
    bool(true)
    ["pages"]=>
    bool(true)
    ["feeds"]=>
    bool(true)
    ["ep_mask"]=>
    int(1)
  }
  ["show_in_rest"]=>
  bool(false)
  ["rest_base"]=>
  bool(false)
  ["rest_controller_class"]=>
  bool(false)
  ["rest_controller"]=>
  NULL
}

Author archive

object(WP_User)#4818 (8) {
  ["data"]=>
  object(stdClass)#4817 (10) {
    ["ID"]=>
    string(1) "1"
    ["user_login"]=>
    string(5) "admin"
    ["user_pass"]=>
    string(34) "xxxxxxxxxxxxxxxxxxxxxxxxxxx"
    ["user_nicename"]=>
    string(5) "admin"
    ["user_email"]=>
    string(24) "dev-email@flywheel.local"
    ["user_url"]=>
    string(0) ""
    ["user_registered"]=>
    string(19) "2019-12-16 12:48:44"
    ["user_activation_key"]=>
    string(0) ""
    ["user_status"]=>
    string(1) "0"
    ["display_name"]=>
    string(5) "admin"
  }
  ["ID"]=>
  int(1)
  ["caps"]=>
  array(1) {
    ["administrator"]=>
    bool(true)
  }
  ["cap_key"]=>
  string(15) "wp_capabilities"
  ["roles"]=>
  array(1) {
    [0]=>
    string(13) "administrator"
  }
  ["allcaps"]=>
  array(66) {
    ["switch_themes"]=>
    bool(true)
    ["edit_themes"]=>
    bool(true)
    ["activate_plugins"]=>
    bool(true)
    ["edit_plugins"]=>
    bool(true)
    ["edit_users"]=>
    bool(true)
    ["edit_files"]=>
    bool(true)
    ["manage_options"]=>
    bool(true)
    ["moderate_comments"]=>
    bool(true)
    ["manage_categories"]=>
    bool(true)
    ["manage_links"]=>
    bool(true)
    ["upload_files"]=>
    bool(true)
    ["import"]=>
    bool(true)
    ["unfiltered_html"]=>
    bool(true)
    ["edit_posts"]=>
    bool(true)
    ["edit_others_posts"]=>
    bool(true)
    ["edit_published_posts"]=>
    bool(true)
    ["publish_posts"]=>
    bool(true)
    ["edit_pages"]=>
    bool(true)
    ["read"]=>
    bool(true)
    ["level_10"]=>
    bool(true)
    ["level_9"]=>
    bool(true)
    ["level_8"]=>
    bool(true)
    ["level_7"]=>
    bool(true)
    ["level_6"]=>
    bool(true)
    ["level_5"]=>
    bool(true)
    ["level_4"]=>
    bool(true)
    ["level_3"]=>
    bool(true)
    ["level_2"]=>
    bool(true)
    ["level_1"]=>
    bool(true)
    ["level_0"]=>
    bool(true)
    ["edit_others_pages"]=>
    bool(true)
    ["edit_published_pages"]=>
    bool(true)
    ["publish_pages"]=>
    bool(true)
    ["delete_pages"]=>
    bool(true)
    ["delete_others_pages"]=>
    bool(true)
    ["delete_published_pages"]=>
    bool(true)
    ["delete_posts"]=>
    bool(true)
    ["delete_others_posts"]=>
    bool(true)
    ["delete_published_posts"]=>
    bool(true)
    ["delete_private_posts"]=>
    bool(true)
    ["edit_private_posts"]=>
    bool(true)
    ["read_private_posts"]=>
    bool(true)
    ["delete_private_pages"]=>
    bool(true)
    ["edit_private_pages"]=>
    bool(true)
    ["read_private_pages"]=>
    bool(true)
    ["delete_users"]=>
    bool(true)
    ["create_users"]=>
    bool(true)
    ["unfiltered_upload"]=>
    bool(true)
    ["edit_dashboard"]=>
    bool(true)
    ["update_plugins"]=>
    bool(true)
    ["delete_plugins"]=>
    bool(true)
    ["install_plugins"]=>
    bool(true)
    ["update_themes"]=>
    bool(true)
    ["install_themes"]=>
    bool(true)
    ["update_core"]=>
    bool(true)
    ["list_users"]=>
    bool(true)
    ["remove_users"]=>
    bool(true)
    ["promote_users"]=>
    bool(true)
    ["edit_theme_options"]=>
    bool(true)
    ["delete_themes"]=>
    bool(true)
    ["export"]=>
    bool(true)
    ["create_blog_partssss"]=>
    bool(true)
    ["create_blog_parts"]=>
    bool(true)
    ["create_ad_tag"]=>
    bool(true)
    ["create_speech_balloon"]=>
    bool(true)
    ["administrator"]=>
    bool(true)
  }
  ["filter"]=>
  NULL
  ["site_id":"WP_User":private]=>
  int(1)
}

Date archive (year)

NULL

Date archive (month)

NULL

Date archive (day)

NULL

Search

NULL

404

NULL

Atachment file

object(WP_Post)#4800 (24) {
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How to install Vim on XSERVER

Ko Takagi — Wed, 29 Jan 2020 08:44:26 +0000

XSERVER is one of the most popular hosting service in Japan.

It is possible to connect to the server via ssh, but Vim is not installed.

I often work with Vim on the server, so I installed Vim using the following steps:

Step1: Install ncurses

mkdir ~/opt && cd $_
wget http://ftp.gnu.org/pub/gnu/ncurses/ncurses-6.1.tar.gz
tar zxfv ncurses-6.1.tar.gz
cd ncurses-6.1
./configure --prefix=$HOME/local
make
make install

Step2: Install Vim

cd ~/opt
git clone https://github.com/vim/vim.git
cd vim
./configure --with-features=huge --enable-fail-if-missing --prefix=$HOME/local --with-local-dir=$HOME/local
make
make install

Step3: Setting environment

vi ~/.bashrc

# Add alias to .bashrc
export PATH=$PATH:$HOME/local/bin
alias vi='vim'

Reload .bashrc

source ~/.bashrc

Now you can use the vim command.

Have a great day👍

Linux commands useful when performing heavy processing

Ko Takagi — Sat, 28 Dec 2019 22:18:57 +0000

sleep

The sleep command suspends processing for a certain period of time.

For example, when running a heavy shell script, using the sleep command moderately can reduce the load.

# Delay 10 seconds(no option)
sleep 10

# Delay 10 seconds
sleep 10s

# Delay 5 minutes
sleep 5m

# Delay 3 hours
sleep 3h

nice/renice

The nice command can be executed with priorities.

For example, when performing a backup or batch process, the process can be performed without affecting other processes.

You will be able to batch process more safely, even at lunchtime when the website is crowded by many people.

# Without option, run at +10 priority
nice /path/to/command

# Run at +10 priority
nice -n 10 /path/to/command

Priority options can be specified from -20 (higher) to 19 (lower). However, negative values can only be specified by superuser.

You can also use the renice command to adjust the priority of already running processes.

# Adjust the priority of pid 99999 process
renice 10 -p 99999

nohup

If you use the nohup command, you can continue processing even if you log out of the terminal.

After executing the command, you can close the computer and go to bed calmly.

nohup /path/to/command &

Standard output during execution of the nohup command is saved in the nohup.out file.

Installing Laravel Homestead on MacOS🔧

Ko Takagi — Sat, 21 Dec 2019 23:28:50 +0000

Laravel Homestead is official local development environment.
It is a great tool that allows you to easily create an environment with all the functions required for development.

The following is the steps for installing Laravel 6.x on MacOS with Homestead.

Install VirtualBox.

Downloads – Oracle VM VirtualBox https://www.virtualbox.org/wiki/Downloads

Install Vagrant.

Download - Vagrant by HashiCorp https://www.vagrantup.com/downloads.html

Install the Homestead Vagrant box.

$ vagrant box add laravel/homestead

By the way, if you couldn't install homestead above command, you can use the following:

$ vagrant box add laravel/homestead https://vagrantcloud.com/laravel/homestead

Install Homestead.

$ git clone https://github.com/laravel/homestead.git ~/Homestead

Create the Homestead configration file.

$ cd ~/Homestead
$ bash init.sh

Homestead.yaml is created in the directory.

$ cat Homestead.yaml
---
ip: "192.168.10.10"
memory: 2048
cpus: 2
provider: virtualbox

authorize: ~/.ssh/id_rsa.pub

keys:
    - ~/.ssh/id_rsa

folders:
    - map: ~/code
      to: /home/vagrant/code

sites:
    - map: homestead.test
      to: /home/vagrant/code/public

databases:
    - homestead

features:
    - mariadb: false
    - ohmyzsh: false
    - webdriver: false

# ports:
#     - send: 50000
#       to: 5000
#     - send: 7777
#       to: 777
#       protocol: udp

View the folders property of the Homestead.yaml file.

folders:
    - map: ~/code
      to: /home/vagrant/code

Create directory according to settings.

$ mkdir ~/code

Edit the sites property of the Homestead.yaml file. In the case, the project directory name is myproject.

sites:
    - map: homestead.test
      to: /home/vagrant/code/myproject/public

Add name resolution to hosts file.

$ sudo vi /etc/hosts

192.168.10.10 homestead.test

Launch Vagrant.

$ cd ~/Homestead
$ vagrant up

If there are not id_rsa (secret key) and id_rsa.pub (public key) in ~/.ssh directory, create key files.

$ ssh-keygen -t rsa

Connect to virtual machine using SSH.

$ vagrant ssh

Install Laravel with project name myproject.

$ cd ~/code
$ composer create-project --prefer-dist laravel/laravel myproject

View homestead.test in your browser.

Good Job!👍

Download website files entirely using wget

Ko Takagi — Mon, 16 Dec 2019 13:25:54 +0000

If you want to create a local mirror site, you can download a set of websites by wget.

Usage

wget -P /path/to/download -E -k -m -nH -np -p -c https://example.com

Option	Overview
-P	Set save directory path.
-E	This option will cause the suitable suffix to be appended to the local filename.
-k	After the download is complete, convert the links in the document to make them suitable for local viewing.
-m	Turn on options suitable for mirroring.
-nH	Disable generation of host-prefixed directories.
-np	Do not ever ascend to the parent directory when retrieving recursively.
-p	This option causes Wget to download all the files that are necessary to properly display a given HTML page.
-c	Continue getting a partially-downloaded file.

With basic authentication

wget -P /path/to/download -E -k -m -nH -np -p -c --http-user=username --http-password=password https://example.com

Option	Overview
--http-user	Set username.
--http-password	Set password.