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Robert Howard
Robert Howard

How To Write A Batch File To Automatically Zip A Given Folder

Sometimes it can be useful to programmatically create zip archives or extract files from existing archives. Windows PowerShell 5.0 added two cmdlets for doing just that. The Compress-Archive cmdlet enables you to create new archives from folders or individual files and to add files to archives; Extract-Archive can be used to unzip files.

How To Write A Batch File To Automatically Zip A Given Folder

Note that I added the -Force parameter to overwrite the archive that I created using the first command. Without the -Force parameter, you cannot overwrite existing archives and PowerShell will prompt you to add files to the archive instead.

Extracting files from an archive is even easier than creating one. All you need to do is specify the name of the archive and the destination folder for the unzipped files. The command below extracts the contents of the archive to a folder named InvoicesUnzipped using the Expand-Archive cmdlet.

Resources are, in fact, a special case. When a package is installed into a project, NuGet automatically adds assembly references to the package's DLLs, excluding those that are named .resources.dll because they are assumed to be localized satellite assemblies (see Creating localized packages). For this reason, avoid using .resources.dll for files that otherwise contain essential package code.

Because a NuGet package is just a ZIP file that's been renamed with the .nupkg extension, it's often easiest to create the folder structure you want on your local file system, then create the .nuspec file directly from that structure. The nuget pack command then automatically adds all files in that folder structure (excluding any folders that begin with ., allowing you to keep private files in the same structure).

The advantage to this approach is that you don't need to specify in the manifest which files you want to include in the package (as explained later in this topic). You can simply have your build process produce the exact folder structure that goes into the package, and you can easily include other files that might not be part of a project otherwise:

Again, the generated .nuspec contains no explicit references to files in the folder structure. NuGet automatically includes all files when the package is created. You still need to edit placeholder values in other parts of the manifest, however.

Creating a .nuspec from a .csproj or .vbproj file is convenient because other packages that have been installed into those project are automatically referenced as dependencies. Simply use the following command in the same folder as the project file:

NuGet 2.x supported the notion of a solution-level package that installs tools or additional commands for the Package Manager Console (the contents of the tools folder), but does not add references, content, or build customizations to any projects in the solution. Such packages contain no files in its direct lib, content, or build folders, and none of its dependencies have files in their respective lib, content, or build folders.

You can use various command-line switches with nuget pack to exclude files, override the version number in the manifest, and change the output folder, among other features. For a complete list, refer to the pack command reference.

PKWARE is the company that created and first implemented this file format. The company put together and maintains the current format specification, which is publicly available and allows the creation of products, programs, and processes that read and write files using the ZIP file format.

ZIP files are everywhere. For example, office suites such as Microsoft Office and Libre Office rely on the ZIP file format as their document container file. This means that .docx, .xlsx, .pptx, .odt, .ods, .odp files are actually ZIP archives containing several files and folders that make up each document. Other common files that use the ZIP format include .jar, .war, and .epub files.

Knowing how to create, read, write, and extract ZIP files can be a useful skill for developers and professionals who work with computers and digital information. Among other benefits, ZIP files allow you to:

To get your working environment ready, place the downloaded resources into a directory called python-zipfile/ in your home folder. Once you have the files in the right place, move to the newly created directory and fire up a Python interactive session there.

Now say you want to add hello.txt to a archive using ZipFile. To do that, you can use the write mode ("w"). This mode opens a ZIP file for writing. If the target ZIP file exists, then the "w" mode truncates it and writes any new content you pass in.

You can also use .open() with the "w" mode. This mode allows you to create a new member file, write content to it, and finally append the file to the underlying archive, which you should open in append mode:

In the first code snippet, you open in append mode ("a"). Then you create new_hello.txt by calling .open() with the "w" mode. This function returns a file-like object that supports .write(), which allows you to write bytes into the newly created file.

In this example, you write b'Hello, World!' into new_hello.txt. When the execution flow exits the inner with statement, Python writes the input bytes to the member file. When the outer with statement exits, Python writes new_hello.txt to the underlying ZIP file,

The second code snippet confirms that new_hello.txt is now a member file of A detail to notice in the output of this example is that .write() sets the Modified date of the newly added file to 1980-01-01 00:00:00, which is a weird behavior that you should keep in mind when using this method.

As you learned in the above section, you can use the .read() and .write() methods to read from and write to member files without extracting them from the containing ZIP archive. Both of these methods work exclusively with bytes.