#set -A SUFFIX = c h o
#echo ${#SUFFIX}
#echo faxinput.${SUFFIX}
#echo faxinput.${^SUFFIX}

VALUE=7 ; NEW=5
let "VALUE=VALUE * 10 + NEW"
echo $VALUE

VALUE=7 ; NEW=5
((VALUE=VALUE * 10 + NEW))
echo $VALUE

VALUE=7 ; NEW=5 ; COUNT=14
let COUNT=COUNT+1 "VALUE=VALUE * 10 + NEW"
echo $VALUE $COUNT
echo "There are $((60*60*24*365)) seconds in a non-leap year."
x=23
y=37
echo $((2*x +3*y))
echo $((2*$x +3*$y))