sh Arithmetic Expansion Parameter Expansion

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Loop n times:

while [ $((i=${i:=0}+1)) -le "$n" ]; do
    echo line $i

Output for n=5:

line 1
line 2
line 3
line 4
line 5

Manipulating decimals:

$ i=3.14159; echo $((${i%.*}*2))
$ i=3.14159; echo $((${i#*.}*2))

Got any sh Question?