basename:tldr:9ef07

The command basename ${filename} is used to extract the base name (file name and extension) from the given variable or argument filename. Here's how it works:

• ${filename} represents the variable or argument that holds the file name.
• The command basename then takes this variable or argument as input.
• It extracts only the base name of the file, which is the file name without the directory path.
• The resulting base name is then displayed as the output.

For example, if the variable filename contains the value /path/to/file.txt, running basename ${filename} will output file.txt (removing the /path/to/ part).