open:tldr:d91ec

The command "open ${file-ext}" is not a complete command and it seems to be missing some information. It is likely a placeholder where "${file-ext}" represents a variable or placeholder for the file extension.

In general, the command "open" is used to open a file or launch an application in various operating systems. The specific behavior of the "open" command can vary depending on the operating system being used.

The "${file-ext}" part is used to represent a file extension. A file extension is the part of a file name that comes after the last period, such as ".txt" for a text file or ".jpg" for an image file. By using the variable "${file-ext}", you can substitute it with the desired file extension in the actual command to open a file with a specific extension.

For example, if the command was "open ${file-ext}", and you wanted to open a text file, you would replace "${file-ext}" with ".txt". The resulting command would be "open .txt", indicating that you want to open a text file.