read [-ers] [-a aname] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]
              One line is read from the standard input, or from the file descriptor fd supplied as an argument to the -u option, and the first word is assigned to the
              first name, the second word to the second name, and so on, with leftover words and their intervening separators assigned to the last name.  If there are
              fewer words read from the input stream than names, the remaining names are assigned empty values.  The characters in IFS are used to split the line into
              words using the same rules the shell uses for expansion (described above under Word Splitting).  The backslash character (\) may be used to  remove  any
              special meaning for the next character read and for line continuation.  Options, if supplied, have the following meanings:
              -a aname
                     The  words  are  assigned  to  sequential indices of the array variable aname, starting at 0.  aname is unset before any new values are assigned.
                     Other name arguments are ignored.
              -d delim
                     The first character of delim is used to terminate the input line, rather than newline.
              -e     If the standard input is coming from a terminal, readline (see READLINE above) is used to  obtain  the  line.   Readline  uses  the  current  (or
                     default, if line editing was not previously active) editing settings.
              -i text
                     If readline is being used to read the line, text is placed into the editing buffer before editing begins.
              -n nchars
                     read returns after reading nchars characters rather than waiting for a complete line of input, but honor a delimiter if fewer than nchars charac‐
                     ters are read before the delimiter.
              -N nchars
                     read returns after reading exactly nchars characters rather than waiting for a complete line of input, unless EOF is encountered  or  read  times
                     out.  Delimiter characters encountered in the input are not treated specially and do not cause read to return until nchars characters are read.
              -p prompt
                     Display prompt on standard error, without a trailing newline, before attempting to read any input.  The prompt is displayed only if input is com‐
                     ing from a terminal.
              -r     Backslash does not act as an escape character.  The backslash is considered to be part of the line.  In particular, a backslash-newline pair  may
                     not be used as a line continuation.
              -s     Silent mode.  If input is coming from a terminal, characters are not echoed.
              -t timeout
                     Cause  read  to time out and return failure if a complete line of input (or a specified number of characters) is not read within timeout seconds.
                     timeout may be a decimal number with a fractional portion following the decimal point.  This option is only effective if read  is  reading  input
                     from  a terminal, pipe, or other special file; it has no effect when reading from regular files.  If read times out, read saves any partial input
                     read into the specified variable name.  If timeout is 0, read returns immediately, without trying to read any data.  The  exit  status  is  0  if
                     input is available on the specified file descriptor, non-zero otherwise.  The exit status is greater than 128 if the timeout is exceeded.
              -u fd  Read input from file descriptor fd.

              If  no  names are supplied, the line read is assigned to the variable REPLY.  The return code is zero, unless end-of-file is encountered, read times out
              (in which case the return code is greater than 128), a variable assignment error (such as assigning to a readonly variable) occurs, or an  invalid  file
              descriptor is supplied as the argument to -u.