This command is part of the [TclX] package.

    :   '''read_file''' ?'''-nonewline'''? ''fileName''
    :   '''read_file''' ''fileName numBytes''
Returns the contents of the file called ''fileName''. If '''-nonewline''' is given, discard the last character if it is a newline. If ''numBytes'' is given, read only that number of bytes from the front of the file (unless the file is shorter than that, in which case the whole file is returned).

Compare with [open] and [read].

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