CheckPacman

checkpacman.zsh

#!/bin/zsh

# add the line under to your zshrc:
# source checkpacman.zsh

rnd=$(( (RANDOM % 5) ))
if [ $rnd -ne 0 ]; then
	return
else
	echo "Checking the time of last update..."
fi

while read line; do
	if [[ `echo "$line" | sed -e "s/: [0-9]*:.*;\(.*\)/\1/"` =~ .*pacman\ -Syu.* ]]; then
#		echo $line
		typeset -i LASTRUN=`echo "$line" | sed -e 's/: \(.*\):.*;.*/\1/'`
		typeset -i DATENOW=`date +%s`
		typeset -i INTERVAL=`expr $DATENOW - $LASTRUN`
		if [ ${INTERVAL} -gt 604800 ]; then
			flag="1"
		else
			flag="0"
	fi

		if [ ${flag} -eq 1 ]; then
			echo "It's time to update your system."
		fi
	fi
done < $HISTFILE