add readme and status file

mysql_backup.sh

@@ -9,6 +9,7 @@ defaultfile=/root/.my.cnf
 rdir=${1:-/root/backups/mysql}
 dir=${rdir}/$(date "+%Y.%m.%d")
 error=0
+status_file=/var/run/backup_mysql.status
 mkdir  -p $dir
 cd $dir
 
@@ -33,4 +34,5 @@ while read uh; do mysql --defaults-file=${defaultfile} -BNe "show grants for $uh
 if [ $error -eq 0 ] ; then
    find $rdir  -maxdepth 1 -type d -mtime +${rotate} -exec rm -fr {} \;
 fi
+echo $error > $status_file
 exit $error