A, for circulation
The first style for ((;;;)) (C-like style)
do
command
done
例子：for ((i=0;i<10;i++))
do
echo $i
done
The second style for variable in {list}
do
command
done
Examples: for i in {1..10..2} // print the odd-numbered 1-10.
do
echo $i
done
a = (1 2 3 9 8 60 625) // array a defined
for i in $ {a [*]} // iterate
do
echo $i
done
Two, while circulation
while expression
do
command
done
Examples (Print 0-10): a = 0
while [ a -ge 10 ]
do
echo $ a
let "a++"
done
while (( a >=10))
do
echo $ a
let "a++"
done
Two, until the cycle
And while similar, while only condition is satisfied before the implementation of the loop, until only the conditions are not established before the implementation of the loop)
Three, break
Force Quit for loop
example:
sum=0
for((i=1;i<=100;i++))
do
let "sum=sum+i"
if [ sum -gt 1000 ]
then
echo "1+2+..+$i=$sum"
break
be
done
Four, continue
Skip this statement following the loop, the next execution cycle