shell

批量清除过期的binlog释放磁盘空间

clearbinlog.sh脚本如下:

for masterdb in `cat master.db.full`;do
#1 echo get the binlog position infomation
    str_log_files=`ssh $masterdb "/opt/mysql/product/5.5.25a/bin/mysql -uroot --password="" -e "show slave statusG;" |grep -i master_Log_File "`
    echo $str_log_files;
    log_file=`echo $str_log_files | awk '{print $2}'`;
    echo $log_file;
#2 echo get the master ip address or master hostname
    db01tmp=`ssh $masterdb "  /opt/mysql/product/5.5.25a/bin/mysql  -uroot  --password=""  -e "show slave statusG;" |grep -i Master_Host  "`;
    db01=`echo $db01tmp | awk '{print $2}'`
#3 begin to clear the old binlog
    ssh $db01 "/opt/mysql/product/5.5.25a/bin/mysql  -uroot  --password="" -e "purge master logs to '$log_file';""
#4 check the disk space for master
    ssh $db01 "df -h"
    echo " "
    echo " -- -- -- ";
done;

最后再次check disk space，执行check_disk.sh脚本，脚本内容如下：

for masterdb in `master.db.full`;do
  ssh  $masterdb "df -h" |grep -i mysqldatadir;
done;

写了一个脚本，run这个脚本，就可以kill掉MySQL中所有sleep的client线程
vim killsleep.sh

#It is used to kill processlist of mysql sleep

#!/bin/sh
while :


do
  n=`mysqladmin processlist -uadmin -pxxxxx|grep -i sleep |wc -l`
  date=`date +%Y%m%d[%H:%M:%S]`
  echo $n


  if [ "$n" -gt 10 ]
  then
  for i in `mysqladmin processlist -uadmin -pxxxxxx|grep -i sleep |awk '{print $2}'`
  do
     mysqladmin -uadmin -pxxxx kill $i
  done
  echo "sleep is too many I killed it " >> /tmp/sleep.log
  echo "$date : $n" >> /tmp/sleep.log
  fi               
  sleep 1
done

sed替换扩展部分

（1）在每一行的末尾加分号

sed 's/.*/&;/' g.sql >g1.sql
awk '{print $0,"xxxx"}' file

（2）去掉第一行记录

sed -i '1d' g1.log

（3）在每行的头添加字符，比如"HEAD"，命令如下：

sed 's/^/HEAD&/g' test.file

（4）在每行的行尾添加字符，比如“TAIL”，命令如下：
sed 's/$/&TAIL/g' test.file

（5）删除检索到的行,-i在源文件上面修改

sed -i '/grant fors/d' t.file

（6）sed替换