循环流程

for

# 方式 1
for item in item1 item2 item3; do
	echo $item
done

# 方式 2
items="item1 item2 item3"
for item in $items; do
	echo $item
done

# 方式 3
items=(item1 item2 item3)
for item in ${item[@]}; do
	echo $item
done

推导式

for i in {01..15}; do
  echo $i
done

案例

# 循环 5 次
for i in {1..5}; do
	echo $i
done


n=5 # 可以从别的函数获取长度
for ((i = 1; i <= n; i++)); do
	echo $i
done

# 遍历当前文件，获取文件类型
for filepath in ./*; do
	file $filepath
done

while

grep -v '^ *#' < file | while IFS= read -r line
do
  echo "Line: $line"
done