qrcp:tldr:1b03d  
        The command you mentioned, qrcp send ${filename_or_directory filename_directory ---}, is a command that uses the qrcp tool to send a file or directory from one device to another using a QR code.
Here's a breakdown of the command:
- 
qrcp: This is the command itself, which stands for "QR code copy." It is a tool that allows you to transfer files via QR codes. - 
send: This is a subcommand ofqrcpused to initiate the file transfer. - 
${filename_or_directory filename_directory ---}: This is a placeholder indicating that you need to replace${filename_or_directory}with the actual name of the file or directory you want to transfer. The---indicates that any further options should not be interpreted as command-line options but as the actual file or directory name. 
To use this command, you would replace ${filename_or_directory} with the name of the file or directory you want to send. For example, if you want to send a file named "example.txt," you would run qrcp send example.txt. Similarly, if you want to send a directory named "my_directory," you would run qrcp send my_directory.