wal:tldr:3be71

The command "wal --preview ${image-png}" is likely used in a Unix-like operating system and is related to a utility called "wal" (short for "pywal").

The "wal" utility is used to generate color schemes and apply them to various applications, primarily for terminal emulators, window managers, and other CLI-based tools. It allows the user to dynamically change the color scheme of their environment to match a selected image or set of colors.

In the given command, "--preview" is an option provided by "wal." This option is used to generate a preview of the color scheme that will be applied based on the selected image. The "${image-png}" is a placeholder that should be replaced with the path or name of the image file (in PNG format) you want to use as a basis for generating the color scheme.

By executing this command, the "wal" utility will analyze the selected image and generate a color palette or scheme. The "--preview" option will display a preview of how the color scheme will look like, showcasing the colors extracted from the image. This preview helps the user to determine whether the generated color scheme is appropriate or needs modification before being permanently applied.

Note: The specific behavior and usage of the "wal" utility may vary slightly depending on the version and configuration of the tool installed on your system.