pngcheck:tldr:353a1

The command "pngcheck -s ${image-png}" is used to perform a check on a PNG image file.

Here is the breakdown of each part of the command:

• "pngcheck": It is the name of the command that will be executed.
• "-s": It is an option or flag used to specify a specific action to be performed by the command. In this case, the "-s" option stands for "summary mode" and it tells pngcheck to only display a summary of the PNG file rather than checking all the chunks and other details.
• "${image-png}": It represents a variable that should be replaced with the actual path or filename of a PNG image file. This is the argument that the pngcheck command will operate on.

When the command is executed, it will run the pngcheck tool, which will read the specified PNG image file and provide a summary of its contents. This summary typically includes information about the PNG file's dimensions, color type, bit depth, compression method, etc. This can be useful for quickly checking basic information about a PNG file without going through a detailed analysis.