写一个Shell脚本，实现登录Linux的同时，检查并打印当前机器的信息：
系统的基础信息、内存、CPU、网络以及Docker或containerd的状态。
vim login_check.sh
#!/bin/bash
clear
LogFileName=polling.$(date +%F-%T)
EchoFormat=$(for (( i=0;i<30;i++ ));do echo -n "=";done)
# 显示标题
show_header() {
printf "${EchoFormat} %s ${EchoFormat}\n" "$1"
}
# 系统信息
SystemInfo() {
show_header "系统信息"
printf "系统类型: %-10s\n" $(uname -a | awk '{print $NF}')
printf "系统版本: %-10s\n" "$(cat /etc/redhat-release)"
printf "内核信息: %-10s\n" $(uname -r)
printf "主机名: %-10s\n" $(uname -n)
printf "编码格式: %-10s\n" ${LANG}
printf "系统当前时间: %-10s %-10s\n" $(date +%F) $(date +%T)
printf "系统运行负载: %-4s %-1s\n" $(uptime | awk -F: '{print $5 }' | awk -F, '{print $1,"%"}')
printf "系统运行天数: %-10s\n" $(uptime |awk '{print $3}')
printf "在线用户人数: %-3s\n" $(w |tail -n +3 |wc -l)
printf "SELinux: %-10s\n" $(grep "SELINUX=[d|e|p]" /etc/selinux/config |awk -F= '{print $2}')
echo -e "最后一次修改时间: $(uptime -p)"
echo -e "IP地址: $(hostname -I | cut -d' ' -f1)"
echo -e "Cpu处理器: $(lscpu | grep "Model name:" | sed 's/Model name:\s*//')"
echo -e "内存空间: $(free -h | awk '/^Mem:/ { print $3 "/" $2 }')"
echo -e "交换空间: $(free -h | awk '/^Swap:/ { print $3 "/" $2 }')"
}
# CPU信息
CpuInfo() {
show_header "CPU信息"
MemonyId=$(top -b -n1 | awk 'NR==3' | awk -F, '{print $4}' | cut -c 1-5)
MemonyUse=$(echo "100-${MemonyId}" | bc)
printf "逻辑CPU核数: %-3s\n" $(grep "processor" /proc/cpuinfo | sort -u | wc -l)
printf "物理CPU核数: %-3s\n" $(grep "physical id" /proc/cpuinfo | sort -u | wc -l)
printf "CPU架构: %-3s\n" $(uname -m)
printf "CPU设置型号: %-3s\n" "$(grep "model name" /proc/cpuinfo | awk -F: '{print $2}' | sort -u | cut -c 2-50)"
echo -e "CPU 1分钟负载: `awk '{printf "%15s",$1}' /proc/loadavg`"
echo -e "CPU 5分钟负载: `awk '{printf "%15s",$2}' /proc/loadavg`"
echo -e "CPU10分钟负载: `awk '{printf "%15s",$3}' /proc/loadavg`"
printf "使用CPU占比: %-1s %-1s\n" ${MemonyUse} %
printf "空闲CPU占比: %-1s %-1s\n" ${MemonyId} %
printf "占用CPU Top10信息:\n\n"
ps -eo user,pid,pcpu,pmem,args --sort=-pcpu | head -n 10
}
# 内存信息
MemoryInfo() {
show_header "内存信息"
printf "总共内存: %-1s\n" $(free -mh | awk "NR==2" | awk '{print $2}')
printf "使用内存: %-1s\n" $(free -mh | awk "NR==2" | awk '{print $3}')
printf "剩余内存: %-1s\n" $(free -mh | awk "NR==2" | awk '{print $4}')
printf "内存使用占比: %-1s %-1s\n" $(free | grep -i mem | awk '{print $6/$2*100}' | cut -c1-5) %
printf "占用内存排名前10的soft:\n\n"
ps -eo user,pid,pcpu,pmem,args --sort=-pmem | head -n 10
}
# 磁盘使用量排序：
Disk_Info() {
show_header "各分区使用率"
df -h
echo
}
# Swap信息
SwapInfo() {
show_header "Swap信息"
printf "Swap总大小: %-1s\n" $(free -mh | awk "NR==3" | awk '{print $2}')
printf "已用Swap: %-1s\n" $(free -mh | awk "NR==3" | awk '{print $3}')
printf "可用Swap: %-1s\n" $(free -mh | awk "NR==3" | awk '{print $4}')
}
# 网络信息
NetworkInfo() {
show_header "网络信息"
printf "IP地址: %-1s %-1s %-1s %-1s\n" $(ip addr | grep inet | grep -v 127.0.0.1 | awk '{print $2}' | cut -d/ -f1)
printf "网关: %-1s %-1s %-1s %-1s\n" $(ip route show default | awk '{print $3}')
printf "DNS: %-1s %-1s %-1s %-1s %-1s\n" $(grep "nameserver" /etc/resolv.conf | awk '{print $2}')
if (ping -c2 -w2 www.baidu.com &>/dev/null); then
printf "网络是否连通: %s\n" 是
else
printf "网络是否连通: %s\n" 否
fi
}
# Docker检查
DockerInfo() {
show_header "docker运行情况"
local running_containers=$(docker ps --format "{{.Names}}")
local exited_containers=$(docker ps --format "{{.Names}}" | grep Exited)
printf "当前正在运行的容器：\n %s\n" "$running_containers"
printf "当前没有运行的容器：\n %s\n" "$exited_containers"
}
# 主函数
main() {
SystemInfo
CpuInfo
MemoryInfo
Disk_Info
SwapInfo
NetworkInfo
DockerInfo
}
# 执行主函数
main
cp login_check.sh /root/.login_check.sh
chmod +x /root/.login_check.sh
# 编辑.bashrc，在最后添加这个脚本
# vim /root/.bashrc
echo "/root/.login_check.sh" >> /root/.bashrc
保存并退出，并重新登录该Linux。
脚本地址：
https://gitee.com/yeweijie-raul/weijie\_linux\_shell/blob/master/shell\_exercises/login\_check.sh#
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