Quickly resalt all WordPress installation via Bash Script with no need to install any Addons

wp-resalt

#!/bin/bash

SCRIPNAME=$0

function show_help() {
  echo "Resalt Wordpress configurations without any plugins."
  echo "Usage:"
  echo "  -f    Use specific file to resalt ($SCRIPTNAME -f /var/www/html/wordpress/wp-config.php)"
  echo "  -d    Use wp-config.php in given directory ($SCRIPTNAME -d /var/www/html/wordpress)"
  echo "  -a    Use wp-config.php in all subdirectories of given directory ($SCRIPTNAME -a /var/www/html)"
  echo "  -h    Show this help"
  echo "Return values:"
  echo "1 invalid option"
  echo "2 not a file/directory"
  echo "3 not a valid wp-config.php"
  echo "4 WP API not reachable"
}

function resalt() {
  WP_CONFIG=$1
  grep -q "define('AUTH_KEY'," "$WP_CONFIG" &>/dev/null
  if [[ "$?" -ne 0 ]]
  then
    >&2 echo "File is malformed (has no keys defined)"
    return 3
  fi
  SALT=`curl -s https://api.wordpress.org/secret-key/1.1/salt/`
  if [[ "$SALT" != define* ]]
  then
    >&2 echo "Wordpress Salt API not returning proper result"
    return 4
  fi

  AUTHK=$(echo "$SALT" | head -n1 | sed -e 's/&/\\\&/g')
  SAUTHK=$(echo "$SALT" | head -n2 | tail -n1 | sed -e 's/&/\\\&/g')
  LOGGEDK=$(echo "$SALT" | head -n3 | tail -n1 | sed -e 's/&/\\\&/g')
  NONCEK=$(echo "$SALT" | head -n4 | tail -n1 | sed -e 's/&/\\\&/g')
  AUTHS=$(echo "$SALT" | head -n5 | tail -n1 | sed -e 's/&/\\\&/g')
  SAUTHS=$(echo "$SALT" | head -n6 | tail -n1 | sed -e 's/&/\\\&/g')
  LOGGEDS=$(echo "$SALT" | head -n7 | tail -n1 | sed -e 's/&/\\\&/g')
  NONCES=$(echo "$SALT" | head -n8 | tail -n1 | sed -e 's/&/\\\&/g')

  # Use Tabs as delimiter as all other standard ASCII chars are possible within the keys/salts
  # See https://developer.wordpress.org/reference/functions/wp_generate_password/#more-information
  sed -i "s	define[(]'AUTH_KEY',\s*'[^']*'[)];	$AUTHK	" "$WP_CONFIG"
  sed -i "s	define[(]'SECURE_AUTH_KEY',\s*'[^']*'[)];	$SAUTHK	" "$WP_CONFIG"
  sed -i "s	define[(]'LOGGED_IN_KEY',\s*'[^']*'[)];	$LOGGEDK	" "$WP_CONFIG"
  sed -i "s	define[(]'NONCE_KEY',\s*'[^']*'[)];	$NONCEK	" "$WP_CONFIG"
  sed -i "s	define[(]'AUTH_SALT',\s*'[^']*'[)];	$AUTHS	" "$WP_CONFIG"
  sed -i "s	define[(]'SECURE_AUTH_SALT',\s*'[^']*'[)];	$SAUTHS	" "$WP_CONFIG"
  sed -i "s	define[(]'LOGGED_IN_SALT',\s*'[^']*'[)];	$LOGGEDS	" "$WP_CONFIG"
  sed -i "s	define[(]'NONCE_SALT',\s*'[^']*'[)];	$NONCES	" "$WP_CONFIG"
}

while getopts "hf:a:d:" option; do
  case $option in
    h)
      show_help
      exit;;
    f)
      FILE=$OPTARG
      if [ ! -f $FILE ]; then
        echo "$FILE is not a file."
        exit 2
      fi
      resalt "$FILE"
      exit $?;;
    a)
      TOPDIR=$OPTARG
      if [ ! -d $TOPDIR ]; then
        echo "$TOPDIR is not a directory."
        exit 2
      fi
      ls $TOPDIR/*/wp-config.php >/dev/null 2>&1
      if [[ $? -ne 0 ]]; then
        echo "$TOPDIR has no subdirectories containing a wp-config.php."
        exit 2
      fi
      echo "Resalt all in directory: $TOPDIR"
      echo
      EX=0
      for filename in $TOPDIR/*/wp-config.php; do
        echo "Resalt $filename"
        resalt "$filename"
        RET=$?
        EX=$(($RET > $EX ? $RET : $EX))
      done
      exit $EX;;
    d)
      DIR=$OPTARG
      if [ ! -f "$DIR/wp-config.php" ]; then
        echo "$DIR/wp-config.php does not exist."
        exit 2
      fi
      echo "Resalt $DIR/wp-config.php"
      resalt "$DIR/wp-config.php"
      exit $?;;
    \?)
      echo "Not a valid option."
      show_help
      exit 1;;
  esac
done

show_help
exit 1