readlink: missing operand Try 'readlink --help' for more information.

This error message is displayed in the terminal when the readlink command is executed without any arguments or operands. The readlink command is used to display the value of a symbolic link or canonicalize the path of a file. To use the readlink command, you need to specify the path of the symbolic link or file whose value you want to display.

For example, to display the value of a symbolic link named mylink, you can use the following command:

readlink mylink

If you want to canonicalize the path of a file, you can use the -f option followed by the path of the file. For example:

readlink -f /usr/share/doc

This will display the canonicalized path of the /usr/share/doc directory.