ftp:tldr:2ab00

The command "mget ${*-png}" is used to retrieve multiple files matching a specific pattern and extension using the "mget" command. Here's an explanation of each component of the command:

• "mget": This command is commonly used in FTP (File Transfer Protocol) to download multiple files from a remote server to a local system.

• "${*-png}": This is a parameter expansion pattern that selects files matching a specific pattern and extension.

  • "$": This refers to all the arguments supplied to the script or command where this expansion is used. For example, if the command is executed as "mget file1 file2 file3", then "$" would represent "file1 file2 file3".

  • "-png": This part is appended to the end of each argument passed via "$*" to match files ending with the ".png" extension. For example, if there's a file named "image1.png", it would match the pattern and be selected.

Combining these components, the command "mget ${*-png}" would download all the files with the ".png" extension that are specified as arguments when executing the command.