Linux常用脚本100例46-80|助你快速了解Linux系统命令

#!/bin/bash
echo "检查磁盘空间并清理旧内核："
disk_usage=$(df -h | grep '/' | awk '{ print $5 }')
if [[ $disk_usage == *"100%"* ]]; then
  echo "磁盘空间已满，正在清理旧内核..."
  sudo apt autoremove --purge -y
  sudo apt clean
fi

#!/bin/bash
echo "监控系统负载并重启："
load=$(uptime | grep -ohe 'load average[s:][: ].*' | awk '{ print $3 }')
if [[ $load -gt 10 ]]; then
  echo "系统负载过高，正在重启..."
  sudo reboot
fi

#!/bin/bash
echo "检查和修复文件系统（ext4）："
sudo e2fsck -f /dev/sda1

#!/bin/bash
echo "监控网络流量："
nload

#!/bin/bash
echo "自动更新系统并重启："
sudo apt update && sudo apt upgrade -y
sudo reboot

#!/bin/bash
echo "监控磁盘I/O："
iostat -dx /dev/sda

#!/bin/bash
echo "检查和修复MySQL数据库："
mysqlcheck -u root -p --auto-repair --all-databases

#!/bin/bash
echo "监控内存泄漏："
while true; do
  mem_usage=$(free -m | awk '/Mem:/ { print $3/$2 * 100.0 }')
  echo "当前内存使用率：$mem_usage%"
  sleep 60
done

#!/bin/bash
echo "自动备份 PostgreSQL 数据库："
pg_dump -U username -F c -b -v -f /path/to/backup.dump database_name

#!/bin/bash
echo "监控系统资源使用情况："
top -b -n 1

#!/bin/bash
echo "检查系统是否受到 SSH 暴力破解攻击："
failed_logins=$(grep -i "Failed password" /var/log/auth.log | grep -v -i "sshd" | awk '{ print $9 }' | sort | uniq -c | sort -nr | head -n 1)
if [[ $failed_logins -gt 5 ]]; then
  echo "检测到 SSH 暴力破解攻击"
fi

#!/bin/bash
echo "自动清理临时文件："
sudo find /tmp -type f -atime +7 -delete

#!/bin/bash
echo "监控系统服务状态："
systemctl list-units --type=service

#!/bin/bash
echo "自动备份 Nginx 配置文件："
sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.$(date +%Y%m%d%H%M%S)

#!/bin/bash
echo "检查磁盘配额并发送警告邮件："
for user in $(awk '{print $1}' /etc/passwd); do
  if [ $(usermod -U $user | grep -c "User $user may log in") -eq 0 ]; then
    if [ $(df -k /home | grep /home | awk '{print $3}') -lt 500000 ]; then
      echo "用户 $user 的磁盘配额不足" | mail -s "磁盘配额警告" $user
    fi
  fi
done

#!/bin/bash
echo "监控系统运行时间并重启："
days=$uptime | awk -F'(up |,)' '{print $2}' | awk '{print $1}'
if [ "$days" -gt 30 ]; then
  echo "系统运行时间超过30天，正在重启..."
  sudo reboot
fi

#!/bin/bash
echo "自动清理日志文件："
find /var/log -name "*.log" -type f -mtime +30 -exec rm {} ;

#!/bin/bash
echo "监控系统端口并发送警告邮件："
ports=$(netstat -tulnp | grep LISTEN | awk '{print $4}')
for port in $ports; do
  if [ $port != "80/tcp" ] && [ $port != "443/tcp" ]; then
    echo "检测到非标准端口监听" | mail -s "端口监听警告" user@example.com
  fi
done

#!/bin/bash
echo "自动同步时间并设置时区："
sudo timedatectl set-ntp true
sudo timedatectl set-timezone America/New_York

#!/bin/bash
echo "监控系统资源使用情况并发送警告邮件："
high_usage=$(uptime | awk -F'(average: |,)' '{print $2}' | awk '{print $1}')
if [ "$high_usage" -gt 7 ]; then
  echo "系统负载过高" | mail -s "系统负载警告" user@example.com
fi

#!/bin/bash
echo "自动备份 MySQL 数据库并清理旧备份："
mysqldump -u username -p'password' database_name > /path/to/backup/$(date +%Y%m%d%H%M%S).sql
find /path/to/backup -name "*.sql" -mtime +7 -exec rm {} ;

#!/bin/bash
echo "监控系统服务状态并重启服务："
service_status=$(systemctl is-active service_name)
if [ "$service_status" != "active" ]; then
  echo "服务未运行，正在重启..."
  systemctl restart service_name
fi

#!/bin/bash
echo "自动清理缓存文件："
find /tmp -type f -name "*.cache" -exec rm {} ;

#!/bin/bash
echo "监控系统磁盘I/O并发送警告邮件："
io_usage=$(iostat /dev/sda 1 3 | tail -1 | awk '{print $4+$5}')
if [ "$io_usage" -gt 90 ]; then
  echo "磁盘I/O过高" | mail -s "磁盘I/O警告" user@example.com
fi

#!/bin/bash
echo "监控系统日志并发送警告邮件："
if grep -q "Error" /var/log/syslog; then
  echo "系统日志中检测到错误" | mail -s "系统日志错误警告" user@example.com
fi