In the first form, all of the remaining bytes are read from the file given by fileId; they are returned as the result of the command. If the -nonewline switch is specified then the last character of the file is discarded if it is a newline. In the second form, the extra argument specifies how many bytes to read; exactly this many bytes will be read and returned, unless there are fewer than numBytes bytes left in the file; in this case, all the remaining bytes are returned. FileId must be stdin or the return value from a previous call to open; it must refer to a file that was opened for reading.
Any existing end-of-file or error condition on the file is cleared at the beginning of the read command.
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