【SHELL】監控系統信息CPU，磁盤，內存

#!/bin/bash
##############################
#
#system infomation
#
##############################
clear
if `test $# -eq 0`
then
reset_terminal=$(tput sgr0)

# OS type
os=$(uname -o)
echo -e '\E[32m:'"OS type is:" $reset_terminal $os

# OS relase version and name 
os_name=$(cat /etc/issue | grep -e "release")
echo -e '\E[32m:'"OS relase version and name:" $reset_terminal $os_name

# architecture (架構)
architecture=$(uname -m)
echo -e '\E[32m:'"architecture:" $reset_terminal $architecture

# kenner realase
kennerrealase=$(uname -r)
echo -e '\E[32m:'"kenner realase:" $reset_terminal $kennerrealase

# hostname
hostname=$(uname -n)
echo -e '\E[32m:'"hostname:" $reset_terminal $hostname

# Internal ip(內網ip)
internalip=$(hostname -I)
echo -e '\E[32m:'"internal ip:" $reset_terminal $internalip

# external ip(公網)
externalip=$(curl -s http://ipecho.net/plain)
echo -e '\E[32m:'"external ip:" $reset_terminal $externalip

# DNS
nameservers=$(cat /etc/resolv.conf | grep -E "\<nameserver[ ]+" | awk '{print $ NF}')
echo -e '\E[32m:'"DNS:" $reset_terminal $nameservers

# logined user 
who > /tmp/who
echo -e '\E[32m:' "Logined users :" $reset_terminal  && cat /tmp/who
rm -f /tmp/who

########################################



#system mem used (total-free)

system_mem_used=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}END{print (total-free)/1024}' /proc/meminfo)
echo -e '\E[32m:'"system mem used :" $reset_terminal $system_mem_used"M"


#application mem used (total-free-buffer-cache)
app_mem_used=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}/^Cached/{cached=$2}/Buffers/{buffers=$2}END{print (total-free-cached-buffers)/1024}' /proc/meminfo)
echo -e '\E[32m:'"applications mem used :" $reset_terminal $app_mem_used"M"

#cpu load avg
loadaverage=$(top  -n 1 -b | grep "load average" | awk '{print $10 $11 $12}')
echo -e '\E[32m:'"load average used :" $reset_terminal $loadaverage

#disk info
disk_info=$(df -hP | grep -vE "Filesystem|tmpfs" | awk '{print $1 " " $5}')
echo -e '\E[32m:'"disk infomation :" $reset_terminal $disk_info
fi