gifsicle:tldr:b41a7

This command is using a tool called "gifsicle" to manipulate GIF files.

The command syntax is as follows:

gifsicle -b ${path-to-input-gif} --delete '#${0-9}' '#${20-}'

Let's break it down step by step:

1. "gifsicle" is the name of the command line tool that performs various operations on GIF images.

2. "-b" is an option or flag used with the gifsicle command. This flag indicates that the original GIF file should be backed up before making any changes.

3. "${path-to-input-gif}" is a placeholder for the actual path to the input GIF file that you want to modify. You need to replace this placeholder with the specific file path.

4. "--delete" is another option used with gifsicle to specify that certain frames or parts of the GIF should be deleted.

5. "'#${0-9}'" and "'#${20-}'" are patterns to specify which frames should be deleted. The notation "${0-9}" represents a range from 0 to 9, and "${20-}" represents a range from 20 to the end. The number sign (#) indicates that these ranges should be applied to frame numbers.

So, when you run this command, gifsicle will modify the specified input GIF file by deleting frames numbered 0 to 9, as well as frames numbered 20 and beyond. The original GIF file will be backed up, and the modified file will be saved in place of the original.