获取linux系统信息,修改motd

获取Linux 系统信息以及磁盘占用信息,并展示在ssh登录信息中。

获取系统状态信息

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#!/bin/bash
# get load averages
IFS=" " read LOAD1 LOAD5 LOAD15 <<<$(cat /proc/loadavg | awk '{ print $1,$2,$3 }')
# get free memory
IFS=" " read USED FREE TOTAL <<<$(free -htm | grep "Mem" | awk {'print $3,$4,$2'})
# get processes
PROCESS=`ps -eo user=|sort|uniq -c | awk '{ print $2 " " $1 }'`
PROCESS_ALL=`echo "$PROCESS"| awk {'print $2'} | awk '{ SUM += $1} END { print SUM }'`
PROCESS_ROOT=`echo "$PROCESS"| grep root | awk {'print $2'}`
PROCESS_USER=`echo "$PROCESS"| grep -v root | awk {'print $2'} | awk '{ SUM += $1} END { print SUM }'`
# get processors
PROCESSOR_NAME=`grep "model name" /proc/cpuinfo | cut -d ' ' -f3- | awk {'print $0'} | head -1`
PROCESSOR_COUNT=`grep -ioP 'processor\t:' /proc/cpuinfo | wc -l`

W="\e[0;39m"
G="\e[1;32m"

echo -e "
${W}System Info:
$W Distro......: $W`cat /etc/redhat-release`
$W Kernel......: $W`uname -sr`
$W Uptime......: $W`uptime -p`
$W Load........: $G$LOAD1$W (1m), $G$LOAD5$W (5m), $G$LOAD15$W (15m)
$W Processes...:$W $G$PROCESS_ROOT$W (root), $G$PROCESS_USER$W (user), $G$PROCESS_ALL$W (total)
$W CPU.........: $W$PROCESSOR_NAME ($G$PROCESSOR_COUNT$W vCPU)
$W Memory......: $G$USED$W used, $G$FREE$W free, $G$TOTAL$W total$W"

获取磁盘信息

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#!/bin/bash
# config
max_usage=90
bar_width=50
# colors
white="\e[39m"
green="\e[1;32m"
red="\e[1;31m"
dim="\e[2m"
undim="\e[0m"

# disk usage: ignore zfs, squashfs, tmpfs & overlay

mapfile -t dfs < <(df -H -x zfs -x squashfs -x tmpfs -x devtmpfs -x overlay --output=target,pcent,size,used | tail -n+2)
printf "\nDisk Usage:\n"

for line in "${dfs[@]}"; do
# get disk usage
usage=$(echo "$line" | awk '{print $2}' | sed 's/%//')
used_width=$((($usage*$bar_width)/100))
# color is green if usage < max_usage, else red
if [ "${usage}" -ge "${max_usage}" ]; then
color=$red
else
color=$green
fi
# print green/red bar until used_width
bar="[${color}"
for ((i=0; i<$used_width; i++)); do
bar+="="
done
# print dimmmed bar until end
bar+="${white}${dim}"
for ((i=$used_width; i<$bar_width; i++)); do
bar+="="
done
bar+="${undim}]"
# print usage line & bar
echo "${line}" | awk '{ printf("%-31s%+3s ( %+4s / %+4s )\n", $1, $2, $4, $3); }' | sed -e 's/^/ /'
echo -e "${bar}" | sed -e 's/^/ /'
done

添加ssh登录输出

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# 将上面的脚本写入文件 ~/.motdsh/system_info.sh
chmod +x ~/.motdsh/system_info.sh
# 在 ~/.bash_profile 末尾添加
~/.motdsh/system_info.sh
# vim /etc/ssh/sshd_config
PrintMotd no

输出效果

效果图

注:

Github:yboetz/motd