system_space=$(df -h / | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{print $5}' | sed 's/%//')
echo "space used: $system_space%"
if [ $system_space -gt 80 ]; then
    echo "Low system space!"
    echo "Files larger than 1GB:"
    find / -type f -size +1G -exec ls -lh {} \; 2>/dev/null
fi




echo "read a string"
read string
words=$(echo -n "$string"|wc -w)
chars=$(echo -n "$string"|wc -c)
space=$(expr length "$string" - length `echo "$string"|sed "s/ //g"`)
specialsymbols=$(echo $string|grep -o [^A-Za-z0-9_[:space:]]|wc -l)
echo "The number of words = $words"
echo "The number of characters = $chars"
echo "Number of white spaces = $space"
echo "Number of Special symbols =$specialsymbols"