100.dathere.com/appendix.md

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Appendix

Here you may find conceptual content related to the exercises in the book.

qsv version

qsv has multiple versions and may differ for each system. Here we run a command to show what version of qsv this book is using along with other information:

qsv --version

qsv release assets

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.

:name: qsv-release-assets

| File                                      | Platform |
| ----------------------------------------- | ------------------------- |
| `qsv-X.Y.Z-x86_64-pc-windows-msvc.zip`    | 64-bit MSVC (Windows 10+)            |
| `qsv-X.Y.Z.msi`                           | Windows                   |
| `qsv-X.Y.Z-x86_64-pc-windows-gnu.zip`     | 64-bit MinGW (Windows 10+)            |
| `qsv-X.Y.Z-i686-pc-windows-msvc.zip`      | 32-bit MSVC (Windows 10+)               |
| `qsv-X.Y.Z-aarch64-apple-darwin.zip`      | ARM64 macOS (11.0+, Big Sur+)       |
| `qsv-X.Y.Z-x86_64-apple-darwin.zip`       | 64-bit macOS (10.12+, Sierra+)      |
| `qsv-X.Y.Z-aarch64-unknown-linux-gnu.zip` | ARM64 Linux (kernel 4.1, glibc 2.17+)                 |
| `qsv-X.Y.Z-x86_64-unknown-linux-gnu.zip`  | 64-bit Linux (kernel 3.2+, glibc 2.17+)              |
| `qsv-X.Y.Z-x86_64-unknown-linux-musl.zip` | 64-bit Linux with musl 1.2.3              |
| `qsv-X.Y.Z-i686-unknown-linux-gnu.zip`    | 32-bit Linux (kernel 3.2+, glibc 2.17+)                 |

:::{note} The listed OS/architecture are primarily based on information from "The rustc book". :::

(command-data-streams)=

Command data streams (stdin, stdout, and stderr)

The terms stdin, stdout, and stderr may commonly be found within qsv's source code and in the lessons.

Here's a very brief explanation of what each means in the context of a command:

• stdin ("Standard input"): Input data
• stdout ("Standard out"): Output data
• stderr ("Standard error"): Error output

Let's consider the following pipeline as an example:

qsv clipboard | qsv stats -E

• There are two commands ran here, each separated by a pipe (|).
• The output (stdout) of qsv clipboard is used as the input (stdin) of qsv stats -E.

For further explanation you may read online articles regarding piping commands. You may view a few more examples here.