#!/bin/sh
#    Authors:Leitbogioro
#    https://github.com/leitbogioro/
#    https://www.zhihu.com/column/originaltechnic
UpdateLog="/var/log/packagesupdatefile.log"
if [ -f "$UpdateLog" ]; then
  rm -rf $UpdateLog
fi
apt-get update
apt list --upgradable | awk 'END{print NR}' | tee -a "$UpdateLog" > /dev/null 2>&1
UpdateRemind=`cat $UpdateLog | tail -n 1`
Result=$(echo $UpdateRemind)
if [ "$Result" -ge "1" ]; then
  printf "$UpdateRemind packages can be upgraded. Run 'apt list --upgradable' to see them.\n"
fi
rm -rf $UpdateLog