close - Close an open file
Closes the file given by fileId. FileId must be the return value from a
previous invocation of the open command; after this command, it should
not be used anymore. If fileId refers to a command pipeline instead of a
file, then close waits for the children to complete. The normal result
of this command is an empty string, but errors are returned if there are
problems in closing the file or waiting for children to complete.
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