# Documentation

## Start here

| Page | What's in it |
| --- | --- |
| [Installation](installation.md) | Every platform, updating, uninstalling |
| [Getting started](getting-started.md) | Signing in, completion, profiles |
| [The language](language.md) | The grammar: apps, collections, verbs, filters |
| [Output](output.md) | The four response kinds, JSON, colour, exit codes |
| [References](references.md) | Names, short IDs, compound IDs |

## Reference

| Page | What's in it |
| --- | --- |
| [Command reference](commands/README.md) | Every command in the tree (generated) |
| [Mail](commands/mail.md) · [Drive](commands/drive.md) · [Calendar](commands/calendar.md) · [Contacts](commands/contacts.md) · [Pass](commands/pass.md) · [Account](commands/account.md) · [API](commands/api.md) | One page per app |
| [Configuration](configuration.md) | Signing in, profiles, sessions, environment variables |
| [Scripting](scripting.md) | Pipelines, `jq`, cron and systemd |

## Understanding it

| Page | What's in it |
| --- | --- |
| [How it works](how-it-works.md) | Sign-in, keys, scopes, what is encrypted with what |
| [Human verification](human-verification.md) | When Proton asks for a CAPTCHA |
| [Limitations](limitations.md) | Platform constraints and gaps |