#!/bin/bash
#this is a script of mysql backup 
if [ ! -d /mydata/data1/backup ] ;then 
 mkdir /mydata/data1/backup
fi
cd /mydata/data1/backup
file=$(find . -type f -mtime -7 | grep .*all.sql) #查找7天内是否有备份的文件
echo $file
if [ -z $file ] ;then 
 echo "backup all databases..."
 backupfile=$(date +%F-%H-%M-%S)
 mysqldump -uroot --lock-all-tables --flush-logs --master-data=2 --all-databases > /mydata/data1/backup/"$backupfile-all.sql"
 if [ $? -eq 0 ] ;then
 echo "Accomplish,file is $backupfile-all.sql !"
 else 
 echo " Failure !!! "
 fi
else          #查找倒数第二大的二进制文件，作增量备份
 cd ..
 echo "All database backups ,now start doing incremental backups!"
  a=1 
  b=1 
  for file in $(ls |grep mysql-bin |grep -v index);do
    num=$(echo $file |cut -d. -f2 )
    if [ $num -gt $a ];then
      a=$num
    fi 
  done
  unset num file
  num=1 
  for file in $(ls |grep mysql-bin |grep -v index);do
    num=$(echo $file |cut -d. -f2 )
    if [ $num -gt $b -a $num -ne $a ] ; then
      b=$num
      tmp=$file
    fi 
  done
  file1=$(echo $tmp|cut -d. -f1)
  file2=$(echo $tmp|cut -d. -f2)
  mysqlbinlog $tmp > /mydata/data1/backup/"$file1-$file2.sql"
 if [ $? -eq 0 ] ;then 
 echo "Backup completed,file is "$file1-$file2.sql""
 fi
fi