Ben Lobaugh Online


Category: Computing (Page 1 of 47)

Quickly list all hosts in your ssh config

I try to be a good citizen and create unique ssh keys for each service I ssh into. I setup all sorts of fun config items and one of my favorites is host aliases. I have accumulated dozens of hosts in my config file and remembering the names of each can be problematic. I tend to open the config file a couple times a day to find a host. This morning I whipped up a quick command that will dump a list of all my hosts into the terminal with one command. No more opening the config file with an editor and scrolling through it. Hopefully this will be something you can enjoy also!

The command is:

grep -w -i "Host" ~/.ssh/config | sed 's/Host//'

It uses grep to search through the ssh config file and sed to clean up the output.

But wait! That is a lot to type and this was supposed to make life easier. Add this as a shell alias and simply type sshhosts to get the list!

alias sshhosts="grep -w -i "Host" ~/.ssh/config | sed 's/Host//'"

Mute and unmute your mic quickly with this Alfred Workflow

I am on a lot of calls for work every day and juggle several different call applications. Finding the apps mute/unmute button quickly gets tedious. On some apps the UI is so poorly designed as to make toggling the mic nearly unusable.

Enter Alfred! Alfred is an amazing productivity app. Alfred let you run custom commands and hotkeys in custom Workflows.

I created a Workflow that, once installed, allows you to mute and unmute your mic with the command-M hotkey.

To install simply download the Workflow and double click it to load it into Alfred.

Click here to download the Mic PTT Alfred Workflow

The Workflow is on Github! If you have ideas for improvements create a fork and send them to me:

WordPress Multisite: Global options that can be overridden per site

I recently ran into a situation where a WordPress Multisite install needed to have some options replicated across each site, both new and existing. It also needed to be able to override the options per site if so desired. The solution is fairly trivial.

  • Setup the options page in wp-admin. Ensure it exists on all subsites
  • On the main site fill in the values that should be defaulted across all sites
  • Drop the following code into your site and replace the placeholder with your own option name
  • Freely use the values from the main site or alter the options on a subsite

All you need to do to get this working is drop the following code into your site and change the placeholder to be the same as the option name that should be replicated.

add_filter( 'option_{OPTION_NAME}', 'my_option_settings', 10, 2 );
add_filter( 'default_option_{OPTION_NAME}', 'my_option_settings', 10, 2 );

function my_option_settings( $value, $option_name ) {
  // Do not loop on ourself
  if( 1 == get_current_blog_id() ) {
    // Bail out
    return $value;
  if( ! $value ) {
    $value = get_blog_option( 1, $option_name );
  return $value;

WordPress: Add category to permalink and redirect old permalinks

Occasionally you run across a situation where a website permalink structure needs to be changed from what it has been to a new structure. Most sites that have been public will have links to them from other websites that need to properly redirect to the new permalink structure. Removing an element from the permalink structure and redirecting old links is trivial, however adding an additional element to the url structure can be difficult. For example:

A fairly typical structure is: /%year%/%month%/%day%/%postname%/

Lets use a simple example of adding the category to the permalink structure: /%category%/%year%/%month%/%day%/%postname%/

To provide a more useful example:

With category:

The original url is going to display the 404 page. I am going to provide an example that you can use in your own site to capture the url causing the 404 and attempt to locate the new post permalink. If none can be found it will fallback to the 404 page. As long as there is something in the original url you can use to locate a post (like the  %postname%) this method will work with minor tweaks.

add_action( 'template_redirect', 'maybe_redirect_404_old_permalink' );
 * Attempts to forward old permalinks to the new permalink structure
 * @author Ben Lobaugh
function maybe_redirect_404_old_permalink() {
    // Only run this function if we are on a 404
    if( ! is_404() ) {
    // "trick" to get the full URL
    $url = add_query_arg( '', '' );

     * Pull the URL path apart to find a slug (post_name)
     * The final segment should be the slug
    $parts = explode( '/', $url );
    $parts = array_filter( $parts );
    $size = count( $parts );
    $maybe_slug = $parts[ $size ]; // We use size here because the filter turned 1 based

    // Attempt to locate corresponding post in the database
    $args = array(
        'name'        => $maybe_slug,
        'post_type'   => 'post',
        'post_status' => 'publish',
        'numberposts' => 1,

    $posts = get_posts( $args );

    // Identify a found post
    if( $posts && ! empty( $posts[0]->ID ) ) {
        $post_id = $posts[0]->ID;

        $post_url = get_permalink( $post_id );

        // Attempt to forward to the new post permalink
        if( $post_url ) {
            wp_safe_redirect( $post_url, 301 ); // Permanent redirect

     * If we made it down here then we could not find a matching post in
     * the database. No biggie, simply do nothing and display the 404 page
     * as normal 🙂

MySQL: Count number of tables in database

If you need to count the number of tables that exist in a MySQL database you can do so with the following query. Just remember to swap out the database name!

SELECT count(*) 
FROM information_schema.tables 
WHERE table_schema = 'YOUR_DB_NAME'

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