«Andante con moto». Rapidillo, ma non troppo…

#!/bin/bash
# Back up all databases of a server putting each db in a different file
 
# Backup destination directory
BACKUP_DIR="$HOME/backup/"
# Name of the backup file
BACKUP_FILENAME="mysqlbackup"
# Use the date for the filenames
BACKUP_DATE=`date +"%Y%m%d_%H%M%S"`
# Name of the archive file
BACKUP_ARCHIVE=${BACKUP_DIR}${BACKUP_FILENAME}_${BACKUP_DATE}.tgz
TEMP_DIR="/tmp/"
 
# Check if the temporary directory exists, if not, create it
if [ -d ${TEMP_DIR}${BACKUP_FILENAME}/ ]; then
	# directory exists
	echo "Cleaning ${TEMP_DIR} ..."
	rm -rf ${TEMP_DIR}${BACKUP_FILENAME}/*
else
	echo "Creating ${TEMP_DIR} ..."
	mkdir ${TEMP_DIR}${BACKUP_FILENAME}/
fi
 
# Get all database names
DATABASES=`mysqlshow -u root -pmysqlpassword | sed 's/[ +-|]\+//g' | sed '/\-/d' | sed 's/^Databases//g' | sed '/^$/d'`
 
# Dump each db in a different file in the temp dir
for db in $DATABASES; do
	echo item: $db
	mysqldump -v -u root -pmysqlpassword -h localhost --create-options --extended-insert --databases $db > ${TEMP_DIR}${BACKUP_FILENAME}/${BACKUP_DATE}_${db}.sql
done
 
# Create the archive file in the backup dir
pushd ${TEMP_DIR}
tar cfz ${BACKUP_ARCHIVE} ${BACKUP_FILENAME}/${BACKUP_DATE}_*
popd
 
# Remove temp files
echo "Cleaning ${TEMP_DIR} ..."
rm -rf ${TEMP_DIR}${BACKUP_FILENAME}/*
 
# Pretty output
echo "###############################################################################"
echo "   Archive file: ${BACKUP_ARCHIVE}"
echo "   Archive size: "`stat -c%s ${BACKUP_ARCHIVE}`" bytes"
echo "###############################################################################"
echo "End"
echo ""

/**
 * debug; Prints a string and a variable value in red (for debugging purposes).
 * @name string containing the name of the variable
 */
function debug($name) {
	global ${$name};
	global $debug;
	$the_style = "color:#f00;font-weight:bold;";
	// Only show output if debugging is on
	if ($debug == 1) {
		$var = ${$name};
		if (is_array($var)) {
			echo "##<b class=\"bold\">$name</b><br>\n";
			while (list($key, $value) = each($var)){
				print("\n".'<div style="'.$the_style.'">#=>'.$key.' ==> ');
				if (is_array($value)){
					print('<code>');
					print_r($value);
					print('</code>');
				} else {
					echo nl2br($value);
				}
				print('</div>'."\n");
			}
		} else {
			print('<div style="'.$the_style.'">#'.$name.'=>'.$var.'#</div>'."\n");
		}
	}
}

<?php
$debug = 1;
// ...
$mi_mensaje = "Mola Hundo!";
debug("mi_mensaje"); // OJO, se pone el _nombre_ de la variable, no la variable
// ...
?>