The Close(file1, file2, ...) command closes the specified file, which is assumed to have been opened either implicitly by a FileTools[Binary] function or by Open.

The Close function does not return anything.

Closing a file ensures that all data is written to disk.

When exiting Maple by the quit, done, or stop command, all open files are automatically closed.

Closing a file that is not open raises an error.

$\mathrm{fd}≔\mathrm{FileTools}\left[\mathrm{Binary}\right]\left[\mathrm{Open}\right]\left(\mathrm{testfile}\right)$

$\mathrm{fd}≔0$

$\mathrm{FileTools}\left[\mathrm{Binary}\right]\left[\mathrm{Write}\right]\left(\mathrm{fd}\,\mathrm{integer}\left[4\right]\,\left[1\,2\,3\right]\right)$

$12$

$\mathrm{FileTools}\left[\mathrm{Binary}\right]\left[\mathrm{Close}\right]\left(\mathrm{fd}\right)$