tar command builder

The command is written in your browser, by the scripts listed below. Nothing you type leaves this page.

Enforced by your browser

This page's Content Security Policy allows a single destination, the site's audience measurement (connect-src https://stats.r-no.fr, see below), and forbids any form submission (form-action 'none'), so even a bug could not send what you type anywhere. You can read the policy at the top of the page source.

Audience measurement

Like every page of the site, this one counts its visit with Umami, installed on R-no’s own server (stats.r-no.fr). It receives the address of the page, without parameters or anchor, the site you came from (its domain only), your browser, system, language and screen size, and the country, region and city deduced from your IP address, which is not kept. It never receives what you type, nor the result of the tool. No cookie, nothing stored in your browser; if your browser asks not to be tracked (Do Not Track), nothing is measured. The data is erased after 25 months.

• /commun/mesure.js: the filter applied before each sending, written for R-no Toolbox. 1.4 kB
  SHA-256 225eec74fd12623d82fc05ee7d222be629ce454d081c129e8d1e249ed37ee716
• https://stats.r-no.fr/m.js: Umami’s tracker, open source (MIT), served by the measurement server. Its fingerprint is not shown here: it changes with each version of Umami, and you cannot check from your browser that it is the published code. For that part, you have to trust R-no.

What is stored

No cookie, and nothing in the address. What you type is never stored: it disappears when you reload or close the page. Your language is given by the address itself (/en/ or /fr/): nothing is stored to remember it. Like any website, the server records the download of the page and its files in its access logs (IP address, date and time, address requested, browser name). It never receives what you type.

Code that runs here

• app.js: the building of the command and its explanations, written for R-no Toolbox. Not minified, no third-party library. 13.5 kB
  SHA-256 81302b471fbe9c42ef6cdfd1a6e25842ce67fe6d084fdc80bb08e4393763014b
• textes.js: the French messages of the tool, shown by its script (the rest of the French page is written into its HTML when the site is built). It only defines texts, with no logic. 8.6 kB
  SHA-256 15291231d2c607e40ed81b36d7f0d0c3e2de8b4cd4ab0a50da407a1cd94f09ec
• /commun/langue.js: the language helper, the same on every page of the site. It reads the language of the page and gives the tool its messages in that language. It stores nothing. 1.6 kB
  SHA-256 80f76f69773ef628d36d09bf8387cfedebda4529210d7120649b6f5603310631

Before you paste

This page only writes text: it runs nothing, neither here nor on your machine. What you paste into a terminal or a configuration file runs with your rights, so read it first. The code it writes downloads nothing and calls no outside service.

How it was checked

The commands were run with GNU tar 1.35 in short and long form: creation with each compression (except zstd, not installed on the test machine), exclusions, listing, and extraction into a directory whose name has a space, with --strip-components.

Linux and macOS

The options used exist in GNU tar (Linux) and in bsdtar, the tar of macOS: -C, --exclude, --strip-components, -k, -p. Both recognise the compression by themselves when reading.

Check it yourself

Download a script and compare its fingerprint with the one above:
curl -s https://r-no.fr/linux/tar/app.js | shasum -a 256

Limits

The common cases only: no appending to an existing archive (-r), no incremental backup, no splitting in volumes. --exclude patterns are matched a little differently by GNU tar and bsdtar for paths with a /: test with -t first. Owner and group are only restored when extracting as root.