<![CDATA[
for
while
until
======================================================================
# When list runs out, iteration exists
for variable_name in list
do
commands
done
# --------------------------------------------------
#!/bin/sh
sum=0
for i in 1 2 3 4
do
# $sum->0
# $i->1
# 0+1=1
# $((1))->1
sum=$(($sum+$i))
done
echo "The sum of $i numbers is: $sum"
======================================================================
# When condition is false, iteration exists
while condition is true
do
commands
done
# --------------------------------------------------
#!/bin/sh
echo "Enter the number"
read no
fact=1
i=1
while [ $i -le $no ]
do
fact=$(($fact * $i))
i=$(($i + 1))
done
echo "The factorial of $no is: $fact"
======================================================================
# When condition is true, iteration exists
until condition is false
do
commands
done
# --------------------------------------------------
#!/bin/sh
echo "NUMBER"
mn=1
mx=10
until [ $mn -gt $mx ]
do
echo "$mn"
mn=$(($mn + 2))
done
]]>