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for循环
第一种
for ((i = 0; i <= 5; i++))
do
echo "welcome $i times"
done
或
for ((i = 0; i <= 5; i++)); do echo "welcome $i times"; done
第二种
for N in 1 2 3
do
echo $N
done
或
for N in 1 2 3; do echo $N; done
或
for N in {1..3}; do echo $N; done
while循环
第一种
while expression
do
command
…
done
第二种
i=1
while ((i<=3))
do
echo $i
let i++
done