工具与资源github.com
UP：带即时预览编写 Linux 管道的工具
UP: A tool for writing Linux pipes with instant live preview
2018 — 2021，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
up 是一个交互式命令行工具：把任意命令的输出接给它后，可以即时输入后续管道命令并实时预览结果，边试边拼出完整的 Linux 管道。它用 Go 编写，旨在让构建和调试 shell 管道变得更快、更直观。
为什么经久不衰：它把『试错式』拼管道的过程变成即时反馈，这个痛点多年不变，所以 2018 到 2021 反复登上首页，至今仍是学习 shell 管道的实用工具。
HN 评论精选
实时预览工具中逐字输入危险命令可能造成灾难性后果
小心 rm：逐字输入 r、rm、rm -、rm -rf、rm -rf ~、rm -rf ~/、rm -rf ~/tmp——我的文件去哪了？
ptman查看英文原文
Careful with rm: r rm rm - rm -rf rm -rf ~ rm -rf ~/ rm -rf ~/tmp # where did my files go?
赞赏工具的同时建议加沙箱保护，并顺带学到了新的 shell 技巧
这工具看起来有趣又实用！最好别以 root 运行，也许可以加个 --safe 标志，用 Docker 沙箱跑命令。我还第一次见到 paste - - 和 foo |& bar，工作这么多年还能学到新技巧真难得。
pjungwir查看英文原文
This looks like a fun and helpful tool! (Perhaps best to ignore the notice from lshw and not run it as root, ha ha. Maybe even only in some kind of sandbox. I bet they could add a --safe flag so it would make an on-the-fly Docker image with a copy of your cwd, and run the commands in there. Then you have different problems I suppose, but still....) I've never seen `paste - -` before, but that is amazing too! I can't count how many times I've wanted something like that. Surely that will help my own shell pipelines in the future. Also I've never seen `foo |& bar` before. What a neat idea! The surprisingly-valid creativity of it reminds me of Duff's Device. Has anyone else ever found uses for that idiom? After so many years working in the shell, it's such a rare and delightful treat to learn new tricks. Thank you for sharing this with us!
担心交互式执行带来的副作用风险
工具自带警告：写入 rm 或 dd 之类的命令可能像拿着电锯乱跑。副作用对我来说总像潜在的灾难。
crvdgc查看英文原文
> WARNING: Please be careful when using it! It could be dangerous. In particular, writing "rm" or "dd" into it could be like running around with a chainsaw. But you'd be careful writing "rm" anywhere in Linux anyway, no? Side effects always seems like potential disasters for me.
分享不依赖该工具的替代方案：watch 加文件迭代，以及管道中间日志技巧
为了快速迭代管道，我把命令写进文件用 watch -n1 运行，容易修改、可临时注释部分内容。还写了个 plog 函数，用 tee 在管道中间步骤打印日志查看发生了什么。
rgrau查看英文原文
For fast iteration with pipes, using only basic unix tools, and arguably less risky to fat-fingering, I write it in a file, and use watch -n1. Easy to modify, temporarily comment parts of it, etc... Also, I wrote this plog function (for pipe-log, or something): plog() { local msg=${1:-plog} tee >(sed -e "s/^/[$msg] /" | cat 1>&2 ) } That allows me to see what's happening in the middle steps of the pipeline. I ended up compiling a list of tricks like that in https://raimonster.com/scripting-field-guide/ , in case anyone is interested (and feedback is appreciated)
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