“Notice the input redirection to read uses another special form
that includes the ampersand (&) to specify that what follows is
a file descriptor and not a file name.“Use file descriptors in the range 3-9. File descriptors below 3
are used for standard input, output, and error, the ones above 9
may be used by the shell internally.“Although there is no explicit syntax for closing a file,
re-using the file descriptor will close the file before opening the
new file. To be safe you could do the following to close the
files:”
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