> For the complete documentation index, see [llms.txt](https://linux-tutorial-cli.gitbook.io/linux-cli-tutorial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linux-tutorial-cli.gitbook.io/linux-cli-tutorial/txt-files/gzip.md).

# gzip

## gzip

The `gzip` command in Unix and Linux is used for file compression and decompression using the gzip compression algorithm. It is widely used for compressing files to reduce their size for storage, transmission, and backup purposes.

#### Basic Usage

The basic syntax for the `gzip` command is:

```sh
gzip [options] [file(s)]
```

* **`options`**: Optional command-line options to control the behavior of `gzip`.
* **`file(s)`**: The name(s) of the file(s) to compress.

#### Examples

**Compressing a File**

To compress a file using `gzip`:

```sh
gzip filename.txt
```

This command compresses `filename.txt` and creates a compressed file `filename.txt.gz`. After compression, the original file `filename.txt` is typically removed unless the `-k` option is used to keep it.

**Decompressing a File**

To decompress a `.gz` file using `gzip`:

```sh
gzip -d filename.txt.gz
```

This command decompresses `filename.txt.gz` and restores it to `filename.txt`.

**Decompressing with `gunzip`**

Alternatively, you can use `gunzip` for decompression, which is equivalent to `gzip -d`:

```sh
gunzip filename.txt.gz
```

#### Options

**Keep Original File**

* **`-k`**: Keep the original file after compression or decompression.

**Verbose Output**

* **`-v`**: Verbose mode, display compression or decompression statistics.

**Force Compression**

* **`-f`**: Force compression even if the resulting file is larger than the original.

**Specify Compression Level**

* **`-1` to `-9`**: Specify the compression level (1 for fastest compression, 9 for best compression ratio). The default is `-6`.

#### Practical Use Cases

**Compressing Multiple Files**

To compress multiple files at once:

```sh
gzip file1.txt file2.txt
```

This command compresses `file1.txt` and `file2.txt`, resulting in `file1.txt.gz` and `file2.txt.gz`.

**Keeping Original Files**

To keep the original files after compression:

```sh
gzip -k file1.txt
```

This command compresses `file1.txt` to `file1.txt.gz` while keeping the original `file1.txt`.

#### Summary

The `gzip` command is a versatile tool for compressing and decompressing files using the gzip compression algorithm in Unix and Linux systems. It offers various options for controlling compression levels, maintaining original files, and providing verbose output. Understanding its usage and options can help you efficiently manage file compression and storage on your system.

## help

```
gzip [options] files

Compress or decompress files (by default, compresses).

Options:

-f, --force    Force compression even if file is already compressed.
-v, --verbose  Print verbose information.
-c, --stdout   Write output on stdout.
-d, --decompress Decompress.
-h, --help     Show this help message.

For more information, see the gzip man page.
```