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.  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 READ-
                     LINE above) is used to obtain the line.  Readline  uses  the  current
                     (or  default, if line editing was not previously active) editing set-
                     tings.
              -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
                     characters 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 coming from a terminal.
              -r     Backslash does not act as an escape character.  The backslash is con-
                     sidered 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
                     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  timeout  is  0, read returns success if input is available on the
                     specified file descriptor, failure otherwise.   The  exit  status  is
                     greater than 128 if the timeout is exceeded.