这是一个shell脚本仓库，里面有很多实用的功能

功能列表

• 禁止恶意ip登录
• 定时清除nacos产生的日志
• 通过一行脚本命令切换JDK版本

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deny_illegal_ip.sh

• backup hosts.deny

  cp /etc/hosts.deny /etc/hosts.deny.bak

• create illegal_ip file

  touch /xxx/illegal_ip_list.txt

• create cron_task log file

  touch /xxx/cron/task.log

• create cron task, execute the script every 30 minutes

  crontab -e
  
  */30 * * * * /xxx/deny_illegal_ip.sh

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clean_nacos_logs.sh

• replace $LOG_PATH and $ONE_MONTH_AGO_SECONDS in shell

  LOG_PATH="/usr/nacos/bin/logs"
  ONE_MONTH_AGO_SECONDS=`date -d "30 day ago" "+%s"`

• create cron task, execute the script every day

  crontab -e
  
  0 0 * * * /usr/shell_study/clean_nacos_logs.sh

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switch_jdk.sh

• replace $my_versions

  # here are jdk versions you installed
  my_versions=([8]="/usr/java/jdk" [17]="/usr/java/jdk17")

• execute the script with target jdk version

  source switch_jdk.sh version
  or
  . switch_jdk.sh version