From 071083907bb4e25fa1c89c21b5930641dc64baa8 Mon Sep 17 00:00:00 2001
From: Molly Lau <windowsbeta@outlook.com>
Date: Sun, 28 May 2023 11:51:25 +0900
Subject: [PATCH] Create motd.sh

---
 Linux_reinstall/Alpine/motd.sh | 91 ++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 Linux_reinstall/Alpine/motd.sh

diff --git a/Linux_reinstall/Alpine/motd.sh b/Linux_reinstall/Alpine/motd.sh
new file mode 100644
index 0000000..7af2ece
--- /dev/null
+++ b/Linux_reinstall/Alpine/motd.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+#
+
+DISTRIB_DESCRIPTION=`cat /etc/os-release | grep -i "id=" | grep -vi "version\|like\|platform" | cut -d "=" -f2 | sed 's/\"//g' | tr 'A-Z' 'a-z' | sed 's/\b[a-z]/\u&/g'`
+
+figlet "$DISTRIB_DESCRIPTION"
+printf "\n"
+printf "Welcome to %s %s (%s)!\n" "$DISTRIB_DESCRIPTION" "$(uname -o)" "$(uname -r) $(uname -m)"
+printf "\n"
+printf "The Alpine Wiki contains a large amount of how-to guides and general"
+printf "\n"
+printf "information about administrating Alpine systems."
+printf "\n"
+printf "See <https://wiki.alpinelinux.org/>."
+printf "\n"
+printf "\n"
+printf "You can setup the system with the command: setup-alpine"
+printf "\n"
+printf "\n"
+printf "You may change this message by editing /etc/profile.d/motd.sh."
+printf "\n"
+printf "\n"
+
+date=`date`
+load=`cat /proc/loadavg | awk '{print $1}'`
+root_usage=`df -h / | awk '/\// {print $(NF-1)}'`
+memory_usage=`free -m | awk '/Mem:/ { total=$2; used=$3 } END { printf("%3.1f%%", used/total*100)}'`
+
+[[ `free -m | awk '/Swap/ {print $2}'` == "0" ]] && swap_usage="0.0%" || swap_usage=`free -m | awk '/Swap/ { printf("%3.1f%%", $3/$2*100) }'`
+users=`users | wc -w`
+time=`uptime | grep -ohe 'up .*' | sed 's/,/\ hours/g' | awk '{ printf $2" "$3 }'`
+processes=`ps aux | wc -l`
+localip=`hostname -i | awk '{print $1}'`
+
+IPv4=`timeout 0.2s dig -4 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
+[[ "$IPv4" == "" ]] && IPv4=`timeout 0.2s dig -4 TXT CH +short whoami.cloudflare @1.0.0.1 | sed 's/\"//g'`
+IPv6=`timeout 0.2s dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
+[[ "$IPv6" == "" ]] && IPv6=`timeout 0.2s dig -6 TXT CH +short whoami.cloudflare @2606:4700:4700::1001 | sed 's/\"//g'`
+# IP_Check=$(echo $IPv4 | awk -F. '$1<255&&$2<255&&$3<255&&$4<255{print "isIPv4"}')
+IP_Check="$IPv4"
+if expr "$IP_Check" : '[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$' >/dev/null; then
+  for i in 1 2 3 4; do
+    if [ $(echo "$IP_Check" | cut -d. -f$i) -gt 255 ]; then
+      echo "fail ($IP_Check)"
+      exit 1
+    fi
+  done
+  IP_Check="isIPv4"
+fi
+
+[[ ${IPv6: -1} == ":" ]] && IPv6=$(echo "$IPv6" | sed 's/.$/0/')
+[[ ${IPv6:0:1} == ":" ]] && IPv6=$(echo "$IPv6" | sed 's/^./0/')
+IP6_Check="$IPv6"":"
+IP6_Hex_Num=`echo "$IP6_Check" | tr -cd ":" | wc -c`
+IP6_Hex_Abbr="0"
+if [[ `echo "$IPv6" | grep -i '[[:xdigit:]]' | grep ':'` ]] && [[ "$IP6_Hex_Num" -le "8" ]]; then
+  for ((i=1; i<="$IP6_Hex_Num"; i++)){
+    IP6_Hex=$(echo "$IP6_Check" | cut -d: -f$i)
+    [[ "$IP6_Hex" == "" ]] && IP6_Hex_Abbr=`expr $IP6_Hex_Abbr + 1`
+    [[ `echo "$IP6_Hex" | wc -c` -le "4" ]] && {
+      if [[ `echo "$IP6_Hex" | grep -iE '[^0-9a-f]'` ]] || [[ "$IP6_Hex_Abbr" -gt "1" ]]; then
+        echo "fail ($IP6_Check)"
+        exit 1
+      fi
+    }
+  }
+  IP6_Check="isIPv6"
+fi
+
+[[ "${IP6_Check}" != "isIPv6" ]] && IPv6="N/A"
+
+[[ "${IP_Check}" != "isIPv4" ]] && IPv4="N/A"
+
+if [[ "${localip}" == "${IPv4}" ]] || [[ "${localip}" == "${IPv6}" ]] || [[ -z "${localip}" ]] || [[ "${localip}" =~ ":" ]]; then
+  # localip=`ip -o a show | grep -w "lo" | grep -w "inet" | cut -d ' ' -f7 | awk '{split($1, a, "/"); print $2 "" a[1]}'`
+  localip=`cat /etc/hosts | grep "localhost" | sed -n 1p | awk '{print $1}'`
+fi
+
+echo " System information as of $date"
+echo
+printf "%-30s%-15s\n" " System Load:" "$load"
+printf "%-30s%-15s\n" " Private IP Address:" "$localip"
+printf "%-30s%-15s\n" " Public IPv4 Address:" "$IPv4"
+printf "%-30s%-15s\n" " Public IPv6 Address:" "$IPv6"
+printf "%-30s%-15s\n" " Memory Usage:" "$memory_usage"
+printf "%-30s%-15s\n" " Usage On /:" "$root_usage"
+printf "%-30s%-15s\n" " Swap Usage:" "$swap_usage"
+printf "%-30s%-15s\n" " Local Users:" "$users"
+printf "%-30s%-15s\n" " Processes:" "$processes"
+printf "%-30s%-15s\n" " System Uptime:" "$time"
+echo