====== Bourne Shell ======

== Loop through multi line text (including spaces) ==

<code bash>
while read LINE
do
    echo "${LINE}"
done <<< "`printf "line1\nline2"`"
</code>

or in bashish with command output:

<code bash>
while read LINE
do
    echo "${LINE}"
done <<< "$(ls -1)"
</code>

== Calculations ==

awk
<code bash>
echo 3.14158 2.348 | awk '{ printf("%f\n", $1/$2) }' 
echo "" | awk '{ printf("%i\n", 10+5) }'
awk '{ print $1/2 }' <<< "5"
</code>

bc
<code bash>
echo "$charge_percent" | bc -l
</code>

bash
<code bash>
result=$((30*1000/60))
</code>