coffee:tldr:7a11f

This command is using the Coffeescript programming language syntax.

In this command, coffee is a command line tool used to run Coffeescript code.

The ${filename-coffee} part is an example of a substitution or variable expansion. It is typically used in command line interfaces to dynamically replace the value of a variable.

In this case, it suggests that ${filename-coffee} is a variable representing the name of a Coffeescript file. So, when executing the command, ${filename-coffee} will be replaced with the actual filename of the Coffeescript file you want to run.

For example, if you have a file named script.coffee and you run the command coffee script.coffee, ${filename-coffee} will be replaced with script.coffee, and the command executed will be coffee script.coffee.

This approach allows you to run Coffeescript files with different names by simply changing the value of the ${filename-coffee} variable in the command.