Shell 脚本中队列实现方式

先进先出，三种操作

• count: 计数
• enqueue：入队
• dequeue：出队

#!/usr/bin/env bash

array=()

# enqueue

array[${#array[@]}]=1
array[${#array[@]}]=2
array[${#array[@]}]=3

# count
echo "count: ${#array[@]}"

echo "${array[@]}"

echo "----------------"

# dequeue
array=(${array[@]:1})

# count
echo "count: ${#array[@]}"

echo "${array[@]}"

output:

count: 3
1 2 3
----------------
count: 2
2 3