Adding Up a list of numbers with BASH

#create example file
for i in {1..20};do echo $((1 + $RANDOM % 99));done > list.txt

#create example file, with floats
for i in {1..20};do echo $((1 + $RANDOM % 99)).$((1 + $RANDOM % 99));done > list.txt

#add using bash
echo $(($(cat list.txt|tr "\n" "+"|sed 's/+$/\n/g')))

#The above might cause issues with floats
#it's better to use bc
cat list.txt|tr "\n" "+"|sed 's/+$/\n/g'|bc

#you can also use paste
paste -s -d+ list.txt|bc

#awk is another option
cat list.txt| awk '{sum += $1} END {print sum}'