shell生成N位的随机字符串

最新推荐文章于 2024-06-26 09:54:06 发布

原创最新推荐文章于 2024-06-26 09:54:06 发布 · 757 阅读

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这篇博客介绍了如何使用shell脚本创建一个8位的随机字符串，通过循环和字符池操作实现。重点讲解了如何使用`chars`变量、`RANDOM`和字符串切片来生成随机字符。

shell生成8位的随机字符串

#!/bin/bash
function rand_str()
{
        chars=012345689abcdefghiklmnopqrstuvwxyzABCDEFGHIKLMNOPQRSTUVWXYZ
        key=""
        for i in {1..8} ; do
            key=$key"${chars:RANDOM%${#chars}:1}"
        done
        echo $key
}
rand_str

${#chars} ： the number of possible characters

${chars:offset:length}: got characters in chars that shifted at offset, including its next length characters. For example ${chars:3:2} is 34

RANDOM%${#chars} narrows the offset to 0-length of the chars, and :1 tells to get the next 1 character.