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69 lines
2.8 KiB
Markdown
69 lines
2.8 KiB
Markdown
---
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jupytext:
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text_representation:
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extension: .md
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format_name: myst
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kernelspec:
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display_name: Bash
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language: bash
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name: bash
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---
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# Appendix
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Here you may find conceptual content related to the exercises in the book.
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## qsv version
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qsv has multiple versions and may differ for each system. Here we run [a command](https://github.com/jqnatividad/qsv/blob/master/docs/PERFORMANCE.md#version-details) to show what version of qsv this book is using along with other information:
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```{code-cell}
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qsv --version
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```
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## qsv release assets
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A mapping of qsv release files for an arbitrary version X.Y.Z and platforms they may run on are shown in the table below.
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```{table} qsv release assets (vX.Y.Z)
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:name: qsv-release-assets
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| File | Platform |
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| ----------------------------------------- | ------------------------- |
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| `qsv-X.Y.Z-x86_64-pc-windows-msvc.zip` | 64-bit MSVC (Windows 10+) |
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| `qsv-X.Y.Z.msi` | Windows |
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| `qsv-X.Y.Z-x86_64-pc-windows-gnu.zip` | 64-bit MinGW (Windows 10+) |
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| `qsv-X.Y.Z-i686-pc-windows-msvc.zip` | 32-bit MSVC (Windows 10+) |
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| `qsv-X.Y.Z-aarch64-apple-darwin.zip` | ARM64 macOS (11.0+, Big Sur+) |
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| `qsv-X.Y.Z-x86_64-apple-darwin.zip` | 64-bit macOS (10.12+, Sierra+) |
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| `qsv-X.Y.Z-aarch64-unknown-linux-gnu.zip` | ARM64 Linux (kernel 4.1, glibc 2.17+) |
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| `qsv-X.Y.Z-x86_64-unknown-linux-gnu.zip` | 64-bit Linux (kernel 3.2+, glibc 2.17+) |
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| `qsv-X.Y.Z-x86_64-unknown-linux-musl.zip` | 64-bit Linux with musl 1.2.3 |
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| `qsv-X.Y.Z-i686-unknown-linux-gnu.zip` | 32-bit Linux (kernel 3.2+, glibc 2.17+) |
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```
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:::{note}
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The listed OS/architecture are primarily based on [information from "The rustc book"](https://doc.rust-lang.org/nightly/rustc/platform-support.html).
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:::
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(command-data-streams)=
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## Command data streams (`stdin`, `stdout`, and `stderr`)
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The terms `stdin`, `stdout`, and `stderr` may commonly be found within qsv's source code and in the lessons.
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Here's a very brief explanation of what each means in the context of a command:
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- `stdin` ("Standard input"): Input data
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- `stdout` ("Standard out"): Output data
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- `stderr` ("Standard error"): Error output
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Let's consider the following pipeline as an example:
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```bash
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qsv clipboard | qsv stats -E
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```
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- There are two commands ran here, each separated by a pipe (`|`).
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- The output (`stdout`) of `qsv clipboard` is used as the input (`stdin`) of `qsv stats -E`.
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For further explanation you may read online articles regarding piping commands. You may view a few more examples [here](https://zerotomastery.io/cheatsheets/linux-commands-cheat-sheet/#piping-and-command-redirection).
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