【shell】shell中的循环

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