如何在bash中生成一千万个随机字符串 [英] How to generate 10 million random strings in bash

问题描述

我需要为排序算法制作一个很大的测试文件.为此，我需要生成1000万个随机字符串.我怎么做?我尝试在/dev/urandom上使用cat，但是它持续运行了几分钟，当我查看文件时，只有大约8页的字符串.我如何在bash中生成1000万个字符串?字符串应为10个字符长.

I need to make a big test file for a sorting algorithm. For that I need to generate 10 million random strings. How do I do that? I tried using cat on /dev/urandom but it keeps going for minutes and when I look in the file, there are only around 8 pages of strings. How do I generate 10 million strings in bash? Strings should be 10 characters long.

推荐答案

这不能保证唯一性，但是可以在文件中提供1000万条随机行.不太快，但是在我的机器上跑了不到30秒:

This will not guarantee uniquness, but gives you 10 million random lines in a file. Not too fast, but ran in under 30 sec on my machine:

cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 10 | head -n 10000000 > file

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