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UP: A tool for writing Linux pipes with instant live preview

Screenshot of github.com captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 5 calendar years, with breakout response in 2 of them.

submissions
7
submitters
7
observed span
2018–2024
peak thread · 217 comments
485 pts
latest 20+ return · 2021-03-31
485 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

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…

rgrau·485-point thread·

Careful with rm: r rm rm - rm -rf rm -rf ~ rm -rf ~/ rm -rf ~/tmp # where did my files go?

ptman·484-point thread·

Comments moved to https://news.ycombinator.com/item?id=18291302.

sctb·122-point thread·

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
1099

reference only — not used in Hall rules or ranking

Total comments
306

reference only — not used in Hall rules or ranking

Every submission