Openwrt ssh登录显示欢迎和系统信息

1、在/etc/profile.d文件夹中新建一个可执行权限的脚本，如sysinfo.sh

#!/bin/bash

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export LANG=zh_CN.UTF-8

THIS_SCRIPT="sysinfo"
MOTD_DISABLE=""

SHOW_IP_PATTERN="^[ewr].*|^br.*|^lt.*|^umts.*"

DATA_STORAGE=/userdisk/data
MEDIA_STORAGE=/userdisk/snail


# don't edit below here
function display()
{
    # $1=name $2=value $3=red_limit $4=minimal_show_limit $5=unit $6=after $7=acs/desc{
    # battery red color is opposite, lower number
    if [[ "$1" == "Battery" ]]; then
        local great="<";
    else
        local great=">";
    fi
    if [[ -n "$2" && "$2" > "0" && (( "${2%.*}" -ge "$4" )) ]]; then
        printf "%-14s%s" "$1:"
        if awk "BEGIN{exit ! ($2 $great $3)}"; then
            echo -ne "\e[0;91m $2";
        else
            echo -ne "\e[0;92m $2";
        fi
        printf "%-1s%s\x1B[0m" "$5"
        printf "%-11s%s\t" "$6"
        return 1
    fi
} # display


function get_ip_addresses()
{
    local ips=()
    for f in /sys/class/net/*; do
        local intf=$(basename $f)
        # match only interface names starting with e (Ethernet), br (bridge), w (wireless), r (some Ralink drivers use ra<number> format)
        if [[ $intf =~ $SHOW_IP_PATTERN ]]; then
            local tmp=$(ip -4 addr show dev $intf | awk '/inet/ {print $2}' | cut -d'/' -f1)
            # add both name and IP - can be informative but becomes ugly with long persistent/predictable device names
            #[[ -n $tmp ]] && ips+=("$intf: $tmp")
            # add IP only
            [[ -n $tmp ]] && ips+=("$tmp")
        fi
    done
    echo "${ips[@]}"
} # get_ip_addresses


function storage_info()
{
    # storage info
    RootInfo=$(df -h /)
    root_usage=$(awk '/\// {print $(NF-1)}' <<<${RootInfo} | sed 's/%//g')
    root_total=$(awk '/\// {print $(NF-4)}' <<<${RootInfo})
} # storage_info


# query various systems and send some stuff to the background for overall faster execution.
# Works only with ambienttemp and batteryinfo since A20 is slow enough :)
storage_info
critical_load=$(( 1 + $(grep -c processor /proc/cpuinfo) / 2 ))

# get uptime, logged in users and load in one take
UptimeString=$(uptime | tr -d ',')
time=$(awk -F" " '{print $3" "$4}' <<<"${UptimeString}")
load="$(awk -F"average: " '{print $2}'<<<"${UptimeString}")"
case ${time} in
    1:*) # 1-2 hours
        time=$(awk -F" " '{print $3" 小时"}' <<<"${UptimeString}")
        ;;
    *:*) # 2-24 hours
        time=$(awk -F" " '{print $3" 小时"}' <<<"${UptimeString}")
        ;;
    *day) # days
        days=$(awk -F" " '{print $3"天"}' <<<"${UptimeString}")
        time=$(awk -F" " '{print $5}' <<<"${UptimeString}")
        time="$days "$(awk -F":" '{print $1"小时 "$2"分钟"}' <<<"${time}")
        ;;
esac


# memory and swap
mem_info=$(LC_ALL=C free -w 2>/dev/null | grep "^Mem" || LC_ALL=C free | grep "^Mem")
memory_usage=$(awk '{printf("%.0f",(($2-($4+$6))/$2) * 100)}' <<<${mem_info})
memory_total=$(awk '{printf("%d",$2/1024)}' <<<${mem_info})
swap_info=$(LC_ALL=C free -m | grep "^Swap")
swap_usage=$( (awk '/Swap/ { printf("%3.0f", $3/$2*100) }' <<<${swap_info} 2>/dev/null || echo 0) | tr -c -d '[:digit:]')
swap_total=$(awk '{print $(2)}' <<<${swap_info})

c=0
while [ ! -n "$(get_ip_addresses)" ];do
[ $c -eq 3 ] && break || let c++
sleep 1
done
ip_address="$(get_ip_addresses)"

# display info
display "系统负载" "${load%% *}" "${critical_load}" "0" "" "${load#* }"
printf "运行时间:  \x1B[92m%s\x1B[0m\t\t" "$time"
echo "" # fixed newline


display "内存已用" "$memory_usage" "70" "0" " %" " of ${memory_total}MB"
display "交换内存" "$swap_usage" "10" "0" " %" " of $swap_total""Mb"
printf "IP  地址:  \x1B[92m%s\x1B[0m" "$ip_address"
echo "" # fixed newline

display "系统存储" "$root_usage" "90" "1" "%" " of $root_total"
if [ -x /sbin/cpuinfo ]; then
printf "CPU 信息: \x1B[92m%s\x1B[0m\t" "$(echo `/sbin/cpuinfo | cut -d ' ' -f -4`)"
fi
echo ""
echo ""

2、修改/etc/profile文件里的内容

case "$TERM" in
    xterm*|rxvt*)
                export PS1='\[\e[31;1m\]\u@\[\e[32;1m\]\h:\w\$\[\e[012;00m\]'
                ;;
esac

[ -n "$FAILSAFE" ] || {
    for FILE in /etc/profile.d/*.sh; do
        if [ "$FILE" == "/etc/profile.d/sysinfo.sh" ]; then
         [ "$(which bash)" ] && env -i bash "$FILE"
        else
                 [ -e "$FILE" ] && . "$FILE"
                fi
    done
    unset FILE
}

nano /etc/banner

_______  _______  _______                                      

| || || |
| __|| _|| _ |
| |___ | | | | | |
| ___| | | | |_| |
| |___ | | | |
|_______| |___| |_______|

                   _____     _ _ _     _   
                  |     |   | | | |___| |_ 
                  |  |  |___| | | |  _|  _|
                  |__  _|   |_____|_| |_|  
                     |  |       r5200-5cca3d82e

     Q-wrt_360T7 R23.8.12 by 行星防御理事会