How to install the latest wordpress from shell

Downloading wordpress zip file from wordpress.org to your PC then uploading it via ftp or sftp is the neanderthalic way to do it. It’s time consuming and more steps than it should be.  If you are going the hard route you could also copy wordpress codes by hand letter for letter you might even earn 3 karmas on reddit for that.

Doing it through terminal is easy on ubuntu/debian or non-debian like centos.  Just open terminal or shell prompt.  Go to your desired target directory where you want to install wordpress and issue the following commands

wget http://wordpress.org/latest.tar.gz && tar xfz latest.tar.gz

Now you download and untarred wordpress into a directory called wordpress.

If you want to install wordpress in a subdirectory. just rename it

mv wordpress yet_another_failed_blog

if you want to install it to root/current dir, mv everything from inside wordpress path

mv wordpress/* ./

then delete unnecessary files

rm -rf wordpress latest.tar.gz

Proceed with installation using your browser by navigating to your site. Be prepared to have your database name, database user and password ready.

Have a fun word pressing.

How do I reset mysql root password? I can’t login

It happens that you forget the password to the root to your mysql server especially in development server like on WSL system. then now you cannot access and control anything. you are officially an intruder, an outcast, a user without privilege.  LUSER.

Fret no more, as the solution is easy like a bug quashing routine. Actually easier.

Login to SSH or your local terminal. and Type the following commands. make sure you don’t forget the WHERE part and resets password on everything like some people! yours truly.

First you need to tell your mysql server to STAHP


sudo service mysql stop

Then you need a safe mysql daemon and skip grant tables to allow access without checks on privileges. Also skip networking to avoid connection from anywhere and restrict it to localhost for security reasons. The Ampersand is NEEDED


sudo mysqld_safe --skip-grant-tables --skip-networking &

What does mysqld_safe do is explained below from mysql website.

[blockquote]mysqld_safe tries to start an executable named mysqld. To override the default behavior and specify explicitly the name of the server you want to run, specify a –mysqld or –mysqld-version option to mysqld_safe. You can also use –ledir to indicate the directory where mysqld_safe should look for the server.[/blockquote]

Then you should type mysql after couple of lines printed and it seems waiting for prompt.

now in mysql console. type


use mysql;
UPDATE user SET authentication_string = PASSWORD ('YOUR NEW PASS HERE'),plugin='mysql_native_password' WHERE user='root';
FLUSH PRIVILEGES;
exit;

The reason for setting plugin to mysql_native_password is because if you haven’t set password before, left it on default. it will have auth_socket and it might return the following error, when you try to login as root:

connect to server at ‘localhost’ failed
error: ‘Plugin ‘auth_socket’ is not loaded’

now back in shell, stop then start mysql normally


sudo service mysql stop
sudo service mysql start

For non-debian systems, replace mysql with mysqld. because that’s what centos like.

How to join tables to wordpress posts properly not in a hacky way?

In sum;

In function.php of your theme:

function my_theme_join_mytable_to_WPQuery($join) {
    global $wpdb;
    $join .= " LEFT JOIN {$wpdb->prefix}mytable ON $wpdb->posts.ID = {$wpdb->prefix}mytable.postid ";
    return $join;
}
add_filter('posts_join', 'my_theme_join_mytable_to_WPQuery');
Join tables

Jigsaw puzzle symbolizing joined tables © Ajv123ajv | Dreamstime Stock Photos

Explanation:

If you want to join tables in wordpress whether left join or inner to wordpress posts query. Say if you need to display some custom rating, game scores or any other data you want to associate with the table.  It’s more efficient to join the table to the posts database table using wordpress function hooks.  Rather than fetching your custom tables inside the template on the fly.

The benefit of using wordpress hooks and functions is not just efficiency. in using database queries. but also you can let other plugins you install like database caches or other processes to work with your custom tables without any extra steps.

You can use functions.php in your theme or your custom plugin to hook to the posts_join wordpress api.  you need to register table join hook filter with the following command:

add_filter(‘posts_join’, ‘my_theme_join_mytable_to_WPQuery’);

What this does, it tells wordpress to call your custom function my_theme_join_mytable_to_WPQuery  when building the posts fetching query. so every time a user views your site and sees the list of posts or search posts. the function will be called before querying the database.  The filter hook passes the join statement sent by user.

Then add a function with the custom name you’ve chosen earlier: my_theme_join_mytable_to_WPQuery

function my_theme_join_mytable_to_WPQuery($join) {

}

The join variable is a string that contains the join statements added by other filters or wordpress.  you need concatenate to it. as:

$join .= " LEFT JOIN MYTABLE ON MYTABLE.id = wp_posts.post.id = MYTABLE.postid";

then you must return join back

return $join;

It’s better however to use wordpress table names and prefixes.  it’s possible the prefix of tables not wp_ or table names for wordpress change.  instead $wpdb->prefix to get the prefix  and $wpdb->posts to get wordpress post table (this includes the prefix).  I assume your custom table also has the same wordpress prefix as it should.

therefore your table becomes {$wpdb->prefix}mytable

You need to import the variable $wpdb from the global scope.  using global $wpdb.

Finally it would look like this:

 

function my_theme_join_mytable_to_WPQuery($join) {
    global $wpdb;
    $join .= " LEFT JOIN {$wpdb->prefix}mytable ON $wpdb->posts.ID = {$wpdb->prefix}mytable.postid ";
    return $join;
}
add_filter('posts_join', 'my_theme_join_mytable_to_WPQuery');

How to find all symbolic links junctions on windows drive

TL;DR::cmd (administrator) dir /AL /S C:\ 

Or dir /AL /S C:\ > junctions.txt
To print the output to a file. which is better.

Does Windows have symbolic links like Linux?

Yes. windows has symbolic links also called junctions.  What are junctions? they are simply links to another location on a hard drive or network drive. The operating system and most programs will treat symbolic links like if they were actual folder. This is very useful when dealing with low disk space especially on pricey ssd (although these are getting cheaper) or eMMC on laptops.   Some programs simply insist on storing their data on C application data. but they aren’t essential apps that need to run all the time. Things like Android studio or Netbeans.  you may run one or the other most of the time. but still these programs store large amount of data.

Break down of the command:

DIR:  list files and folders in current working directory or specified one.
AL:   A switch is to display files with specific attributes such as hidden files, directories, read only.   L attribute is for Junctions (Reparse Points)
S:  means to include System files in the results.
>  redirects output to a file.