linux下mysql备份脚本

#!/bin/sh

  # mysql_backup.sh: backup mysql databases and keep newest 5 days backup.

  #

  # Last updated: 20 March 2006

  # ----------------------------------------------------------------------

  # This is a free shell script under GNU GPL version 2.0 or above

  # Copyright (C) 2006 Sam Tang

  # Feedback/comment/suggestions : http://www.real-blog.com/

  # ----------------------------------------------------------------------

  # your mysql login information

  # db_user is mysql username

  # db_passwd is mysql password

  # db_host is mysql host

  # -----------------------------

  db_user="root"

  db_passwd="password"

  db_host="localhost"

  # the directory for story your backup file.

  backup_dir="/home/mybackup"

  # date format for backup file (dd-mm-yyyy)

  time="$(date +"%d-%m-%Y")"

  # mysql, mysqldump and some other bin's path

  MYSQL="/usr/bin/mysql"

  MYSQLDUMP="/usr/bin/mysqldump"

  MKDIR="/bin/mkdir"

  RM="/bin/rm"

  MV="/bin/mv"

  GZIP="/bin/gzip"

  # check the directory for store backup is writeable

  test ! -w $backup_dir && echo "Error: $backup_dir isun-writeable." && exit 0

  # the directory for story the newest backup

  test ! -d "$backup_dir/backup.0/" && $MKDIR"$backup_dir/backup.0/"

  # get all databases

  all_db="$($MYSQL -u $db_user -h $db_host -p$db_passwd -Bse 'showdatabases')"

  for db in $all_db

  do

  $MYSQLDUMP -u $db_user -h $db_host -p$db_passwd $db | $GZIP -9 >"$backup_dir/backup.0/$time.$db.gz"

  done

  # delete the oldest backup

  test -d "$backup_dir/backup.5/" && $RM -rf"$backup_dir/backup.5"

  # rotate backup directory

  for int in 4 3 2 1 0

  do

  if(test -d "$backup_dir"/backup."$int")

  then

  next_int=`expr $int + 1`

  $MV "$backup_dir"/backup."$int""$backup_dir"/backup."$next_int"

  fi

  done

  exit 0;