Update WordPress folder with the latest version, backup files and SQL Usage: sh update-wordpress "wordpress-directory-to-update"

update-wordpress.sh

#!/bin/bash
# Update WordPress folder with the latest version, backup files and SQL
# Usage: sh update-wordpress "wordpress-directory-to-update"

# Define variables
BLOG_DIR=/home
BACK_DIR=/home/wp-backups

DATE=`date +%Y%m%d`
INSTANCE=${1}

# If there's no variable, explain usage and exit
if [ -z "$1" ]; then
        echo "usage: sh $0 \"wordpress-directory-to-update\""
        exit 0
fi

# Backup existing database and wordpress directory
mkdir -p ${BACK_DIR}/${INSTANCENAME}/${DATE}
mysqldump -u root ${INSTANCE}_wp > ${BACK_DIR}/${INSTANCENAME}/${DATE}/${INSTANCE}.db.sql
tar -zcvf ${BACK_DIR}/${INSTANCENAME}/${DATE}/${INSTANCE}.tar.gz ${BLOG_DIR}/${INSTANCE}/public_html

# Download latest WordPress CMS
cd /tmp
wget http://wordpress.org/latest.zip
unzip latest.zip

# Overwrite all new files and cleanup
if [ $? -eq 0 ]; then
        cd ${BLOG_DIR}/${INSTANCE}/public_html
        cp -avr /tmp/wordpress/* .
        rm -rf /tmp/wordpress
        rm -f /tmp/latest.zip
        rm -f readme.txt
        rm -f wp-config-sample.php
        chown -R ${INSTANCE}:${INSTANCE} *
        echo "WordPress updated"
else
        echo "Error failed to unzip or download failed"
fi
exit 0

Best script I've seen on git for updating wordpress! Would've been perfect for use if it accepted BLOG_DIR and BACK_DIR but It looks like you already have a set use case for this!