Bits of Code

Collection of code snippets to make command line life a bit easier...

Table of Contents:

• WordPress
• WP-CLI
• PHP
• .htaccess
• Bash Commands
• Bash Scripting

WordPress:

Enable updates when asked for FTP credentials

This happens when file/folder write permissions are set securely

Add this code to wp-config.php

From Stack Overflow

define('FS_METHOD', 'direct');

I love all you, precious plugins, slowing everything to a crawl, phoning home for fresh ads to show, so much.

From Twitter @Rarst

define( 'WP_HTTP_BLOCK_EXTERNAL', true );
define( 'WP_ACCESSIBLE_HOSTS', '*.wordpress.org' );

Stop WP embed script from loading

// Remove WP embed script
function ecotechie_stop_loading_wp_embed() {
    if ( ! is_admin() ) {
        wp_deregister_script( 'wp-embed' );
    }
}
add_action( 'init', 'ecotechie_stop_loading_wp_embed' );

/**
 * Conditionally change menus.
 */
function ecotechie_wp_nav_menu_args( $args = '' ) {
	// change the menu in the Header menu position.
	if ( 'top' === $args['theme_location'] && is_page( '138' ) ) {
		$args['menu'] = '4'; // 4 is the ID of the menu to use here
	}
	return $args;
}
add_filter( 'wp_nav_menu_args', 'ecotechie_wp_nav_menu_args' );

WP-CLI:

Get 20 largest autoloaded option values ordered by largest first

wp db query "SELECT option_name, length(option_value) AS option_value_length FROM wp_options WHERE autoload='yes' ORDER BY option_value_length DESC LIMIT 20;"

Get largest database tables in a "nice" format, excluding anything smaller than 1MB

wp db size --skip-plugins --format=csv --human-readable --all-tables | sed 's/ //g' | sort -k2 -h -t'\"' | grep KB -v | column -t -s, | sed 's/"//g'

Set database option to not autoload

wp db query "UPDATE $(wp db prefix)options SET autoload='no' WHERE option_name='OPTION_NAME'"

PHP:

Quick PHP debug with wp_die()

Replace ... with variables to display on screen

wp_die( '<pre>' . print_r( array( ... ), 1 ) . '</pre>' );

.htaccess:

Attempt to load files from production if they're not in our local version

<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule wp-content/uploads/(.*) \
    http://{PROD}/wp-content/uploads/$1 [NC,L]
</IfModule>

Add www. and https

<IfModule mod_rewrite.c>
  RewriteCond %{HTTP_HOST} !^www\. [NC]
  RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
  RewriteCond %{HTTP:X-Forwarded-Proto} !https
  RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

#not working
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{HTTPS} off
  RewriteCond %{HTTP_HOST} !^www.
  RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

Strip www. add https

<IfModule mod_rewrite.c>
  RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
  RewriteRule ^ https://%1%{REQUEST_URI} [L,R=301]
  RewriteCond %{HTTP:X-Forwarded-Proto} !https
  RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

#or using the hardcoded domain
<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{HTTP_HOST} ^www. [NC,OR]
  RewriteCond %{HTTPS} off
  RewriteRule ^(.*)$ https://DOMAIN.com/$1 [L,R=301]
<IfModule>

#not working
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{HTTPS} off
  RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
  RewriteRule ^(.*)$ https://%1%{REQUEST_URI} [L,R=301]
<IfModule>

Bash Commands:

Generate public/private rsa key pair with (YOUR_EMAIL) as note, then output keys to screen

ssh-keygen -C YOUR_EMAIL -m PEM -f ./id_rsa && echo && cat id_rsa && echo && cat id_rsa.pub

SSH tunnel into a MySQL shell:

ssh -i ./id_rsa -p 22 [email protected] -L 65000:127.0.0.1:3306 -N

Display new information as it is being written to a file (FILE_NAME)

tail --follow FILE_NAME

Display disk space information

df -hT

List directories sorted by total number of files

du -a | cut -d/ -f2 | sort | uniq -c | sort -n

List directories sorted by total number of files recursively, starting with (.)

From StackExchange

find . -type d | while read dir; do echo "$dir" : $(find "$dir" -type f | wc -l); done | sort -k2 -t ':' -n;

List directories and files sorted by size

From StackOverflow

du --all --apparent-size --human-readable --max-depth=1 2>/dev/null | sort -h

Show total size of files of type (.jpg) recursively in a directory (.)

From StackExchange

find . -type f -name '*.jpg' -exec du --apparent-size --human-readable --total {} + | grep total$

Show total size of a directory (.)

From StackExchange

du --summarize --human-readable --apparent-size .

TTL value of a DNS record

From ShellHacks

Remaining

dig +noall +answer domain.com

Configured

DOMAIN=domain.com; dig +noall +answer $DOMAIN @$(dig NS $DOMAIN +short|head -n1)

Website response time

From ShellHacks

curl -s -w '\nLookup time:\t%{time_namelookup}\nConnect time:\t%{time_connect}\nAppCon time:\t%{time_appconnect}\nRedirect time:\t%{time_redirect}\nPreXfer time:\t%{time_pretransfer}\nStartXfer time:\t%{time_starttransfer}\n\nTotal time:\t%{time_total}\n' -o /dev/null domain.com

Print the public IP

ip addr show eth0 | grep inet | awk '{ print $2; }' | sed 's/\/.*$//'

Compress PDF

ps2pdf in.pdf out.pdf

Search recursesively

Files modified on Jan 11 at 4am

find . -type f -ls | grep 'Jan 11 04'

Files edited in date range

find . -type f -newermt 2018-01-10 ! -newermt 2018-01-11

chmod recursevly

CAREFUL WITH THESE!!!

f = files, d = directories

find . -type f ! -perm 0644 -print0 | xargs -0 chmod 644

find . -type d ! -perm 755 -print0 | xargs -0 chmod 755

Find files and directories not owned by GROUPNAME, excluding some paths

find . ! -group GROUPNAME ! -path './APATH/' ! -path './ANOTHERPATH'

Bash Scripting:

Qick and dirty timer

From Unix Stack Exchange

start=`date +%s`
# Code to be timed...
end=`date +%s`

runtime=$((end-start))

or

start_time=$SECONDS
# Code to be timed...
elapsed_time=$(($SECONDS - $start_time))

“Validate Input” Function

Inspired by Tec Admin

validate_input () {
  read -r -p "$*" input 
  while true
  do
    read -r -p "Is $input correct? [Y/n] " maybe

    case $maybe in
      [yY][eE][sS]|[yY]|"")
      echo "$input"
      break
      ;;
      [nN][oO]|[nN])
      read -p "Enter variable again:" $input
      ;;
      *)
      echo "Invalid input..."
      echo
      ;;
    esac
  done
}

"Yes/No" Function

yes_no () {
  echo
  while true
  do
    read -r -p "$* [Y/n] " maybe
    
    case $maybe in
      #Return 0, a non failure status.
      [yY][eE][sS]|[yY]|"")
      return 0
      break
      ;;
      # Return 101, a non-zero (failure) status.
      [nN][oO]|[nN])
      return 101
      break
      ;;
      *)
      echo "Invalid input..."
      ;;
    esac
  done
}

Quick Yes/No logic

read -r -p "What's your question? [y/N] " response
[[ "$response" =~ ^([yY][eE][sS]|[yY])$ ]] && $do_something || $do_something_else