在目录/etc/profile.d增加文件system-info.sh，内容如下：

#/bin/bash
### Welcome to my linux
welcome=$(uname -r)

# Memory
memory_total=$(free -m | awk 'NR==2 { printf($2)}')
if [ $memory_total -gt 0 ]
then
    memory_usage=$(free -m | awk 'NR==2 { printf("%3.1f%%", $3/$2*100)}') 
else
    memory_usage=0.0%
fi

# Swap memory
swap_total=$(free -m | awk 'NR==3 { printf($2)}')
if [ $swap_total -gt 0 ]
then
    swap_mem=$(free -m | awk 'NR==3 { printf("%3.1f%%", $3/$2*100)}')
else
    swap_mem=0.0%
fi

# Usage
usageof=$(df -h / | awk '/\// {print $(NF-1)}')

# System load
load_average=$(awk '{print $1}' /proc/loadavg)

# WHO I AM
whoiam=$(whoami)

# Time
time_cur=$(date)

# Processes
processes=$(ps aux | wc -l)

# Users
user_num=$(users | wc -w)

# Ip address
ip_pre=""
if [ -x "/sbin/ip" ]
then
            ip_pre=$(/sbin/ip a | grep inet | grep -v "127.0.0.1" | grep -v inet6 | awk '{print $2}')
fi

echo -e "\n"
echo -e "Welcome to my Linux $welcome\n"
echo -e "System information as of time: \t\t$time_cur\n"
echo -e "System load: \t\t\033[0;33;40m$load_average\033[0m"
echo -e "Processes: \t\t$processes"
echo -e "Memory used: \t\t$memory_usage"
echo -e "Swap used: \t\t$swap_mem"
echo -e "Usage On: \t\t$usageof"
for line in $ip_pre
do
            ip_address=${line%/*}
            echo -e "IP address: \t\t$ip_address"
done
echo -e "Users online: \t\t$user_num"
if [ -f "/var/infomation/msg.txt" ];then
       pkgnum=$(cat /var/infomation/msg.txt |awk -F':' '{print $2}')
       if [ -n "$pkgnum" ] ;then 
               awk -F":" '{print $1":\t"$2}' /var/infomation/msg.txt
       fi
fi

if [ "$whoiam" == "root" ]
then
        echo -e "\n"
else
        echo -e "To run a command as administrator(user \"root\"),use \"sudo <command>\"."
fi

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