Update wordpress via shell access (3.1+)

update-wordpress.sh

#!/bin/bash
set -ex

# Update wordpress to a specific version. This script should work with versions above 3.1
# If you provide a LANG_CODE. It will be used to the appropriate Wordpress package. 
# LANG_CODE examples: fr_CA, pt_BR, es_ES

# See WP supported languages here: https://codex.wordpress.org/Installing_WordPress_in_Your_Language#Manually_Installing_Language_Files
# See extended WP procedures here: https://codex.wordpress.org/Upgrading_WordPress_Extended

# $0 WORDPRESS_VERSION WORDPRESS_DIR [LANG_CODE] [BACKUP_DIR]
if [ "$#" -ne 2 ] && [ "$#" -ne 3 ] && [ "$#" -ne 4 ]; then
    echo "Illegal number of parameters: only 2, 3 or 4 expected."
    echo "Usage: $0 <WORDPRESS_VERSION> <WORDPRESS_DIR> [LANG_CODE] [BACKUP_DIR]"
    exit 1
fi

WORDPRESS_VERSION=$1
WORDPRESS_DIR=$2
LANG_CODE=$3

USER_BACKUP_DIR=$4
if [ ! -z "$USER_BACKUP_DIR" ] && [ ! -d "$USER_BACKUP_DIR" ]; then
    echo "USER_BACKUP_DIR: $USER_BACKUP_DIR does not exist."
    exit 1
fi

if [ -z "$USER_BACKUP_DIR" ]; then	
	BACKUP_DIR=/tmp
else
	BACKUP_DIR=$USER_BACKUP_DIR
fi

if [ ! -d "$WORDPRESS_DIR" ]; then
    echo "WORDPRESS_DIR: $WORDPRESS_DIR does not exist."
    exit 1
fi

# Preparation
TS=$(date +%s)
TMP_WP_FOLDER=/tmp/WORDPESS-$WORDPRESS_VERSION-$TS
BACKUP_WP_FOLDER=$BACKUP_DIR/WORDPESS-$TS-BACKUP

## backup
mkdir $BACKUP_WP_FOLDER
cp -r $WORDPRESS_DIR $BACKUP_WP_FOLDER
echo "To restore backup: \"rsync -rt --delete $BACKUP_WP_FOLDER/ $WORDPRESS_DIR/\"."

## download 
echo "Downloading..."
if [ -z "$LANG_CODE" ]; then	
	WORDPRESS_FILENAME=wordpress-$WORDPRESS_VERSION.zip
	WORDPRESS_URL=https://wordpress.org/$WORDPRESS_FILENAME
else
	URL_LANG_CODE=$(echo $LANG_CODE | tr '[:upper:]' '[:lower:]' | tr "_" "-" )
	WORDPRESS_FILENAME=wordpress-$WORDPRESS_VERSION-$LANG_CODE.zip
	WORDPRESS_URL=https://$URL_LANG_CODE.wordpress.org/$WORDPRESS_FILENAME
fi

mkdir $TMP_WP_FOLDER
wget -q -O $TMP_WP_FOLDER/$WORDPRESS_FILENAME $WORDPRESS_URL
unzip -q -d $TMP_WP_FOLDER $TMP_WP_FOLDER/$WORDPRESS_FILENAME
echo "New version of wordpress in: $TMP_WP_FOLDER."

# install 
echo "Installing."
rsync -rt --delete --exclude 'wp-content' --exclude 'wp-config.php' $TMP_WP_FOLDER/wordpress/ $WORDPRESS_DIR/ 
rsync -rt $TMP_WP_FOLDER/wordpress/wp-content/ $WORDPRESS_DIR/wp-content/ 
echo "Done."

# cleanup
rm -rf $TMP_WP_FOLDER
echo "Leaving backup in $BACKUP_WP_FOLDER"