ffsend:tldr:30aff

The command "ffsend upload ${filename} -d ${4}" is likely a command used in the command line interface of a tool called "ffsend."

Here's the breakdown of each component:

• "ffsend" is the name of the tool or program being used.
• "upload" is the specific function or action being performed by ffsend, which is uploading a file.
• "${filename}" is a placeholder for the name of the file you want to upload. You would need to replace "${filename}" with the actual filename you want to upload, including the file extension.
• "-d" is an option or flag that stands for "days," indicating the duration for which the uploaded file will be available for download.
• "${4}" is another placeholder, which assumes you need to specify the number of days (duration). You would replace "${4}" with the desired number of days, indicating how long the file should be available for download before it expires.

In summary, this command is instructing the "ffsend" tool to upload a file specified by "${filename}" and set the expiration duration to "${4}" days.