Menu con shellscript

Grub es un boot manager, por lo tanto no usa las mismas librerias que un programa normal, pero si queres ese estilo tendrias que mirar la libreria (n)curses.

Para poder usar ncurses en bash tenes que usar la aplicacion dialog, sino la tenes instalala, podes crear todos los controles, ventanas, etc.

seba@laptop-snf:~$ dialog
cdialog (ComeOn Dialog!) version 1.1-20100428
Copyright 2000-2007,2008 Thomas E. Dickey
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

* Display dialog boxes from shell scripts *

Usage: dialog <options> { --and-widget <options> }
where options are "common" options, followed by "box" options

Special options:
  [--create-rc "file"]
Common options:
  [--ascii-lines] [--aspect <ratio>] [--backtitle <backtitle>]
  [--begin <y> <x>] [--cancel-label <str>] [--clear] [--colors]
  [--column-separator <str>] [--cr-wrap] [--date-format <str>]
  [--default-item <str>] [--defaultno] [--exit-label <str>]
  [--extra-button] [--extra-label <str>] [--help-button]
  [--help-label <str>] [--help-status] [--ignore] [--input-fd <fd>]
  [--insecure] [--item-help] [--keep-tite] [--keep-window]
  [--max-input <n>] [--no-cancel] [--no-collapse] [--no-kill]
  [--no-label <str>] [--no-lines] [--no-ok] [--no-shadow] [--nook]
  [--ok-label <str>] [--output-fd <fd>] [--output-separator <str>]
  [--print-maxsize] [--print-size] [--print-version] [--quoted]
  [--scrollbar] [--separate-output] [--separate-widget <str>] [--shadow]
  [--single-quoted] [--size-err] [--sleep <secs>] [--stderr] [--stdout]
  [--tab-correct] [--tab-len <n>] [--time-format <str>] [--timeout <secs>]
  [--title <title>] [--trace <file>] [--trim] [--version] [--visit-items]
  [--yes-label <str>]
Box options:
  --calendar     <text> <height> <width> <day> <month> <year>
  --checklist    <text> <height> <width> <list height> <tag1> <item1> <status1>...
  --dselect      <directory> <height> <width>
  --editbox      <file> <height> <width>
  --form         <text> <height> <width> <form height> <label1> <l_y1> <l_x1> <item1> <i_y1> <i_x1> <flen1> <ilen1>...
  --fselect      <filepath> <height> <width>
  --gauge        <text> <height> <width> [<percent>]
  --infobox      <text> <height> <width>
  --inputbox     <text> <height> <width> [<init>]
  --inputmenu    <text> <height> <width> <menu height> <tag1> <item1>...
  --menu         <text> <height> <width> <menu height> <tag1> <item1>...
  --mixedform    <text> <height> <width> <form height> <label1> <l_y1> <l_x1> <item1> <i_y1> <i_x1> <flen1> <ilen1> <itype>...
  --mixedgauge   <text> <height> <width> <percent> <tag1> <item1>...
  --msgbox       <text> <height> <width>
  --passwordbox  <text> <height> <width> [<init>]
  --passwordform <text> <height> <width> <form height> <label1> <l_y1> <l_x1> <item1> <i_y1> <i_x1> <flen1> <ilen1>...
  --pause        <text> <height> <width> <seconds>
  --progressbox  <height> <width>
  --radiolist    <text> <height> <width> <list height> <tag1> <item1> <status1>...
  --tailbox      <file> <height> <width>
  --tailboxbg    <file> <height> <width>
  --textbox      <file> <height> <width>
  --timebox      <text> <height> <width> <hour> <minute> <second>
  --yesno        <text> <height> <width>

Auto-size with height and width = 0. Maximize with height and width = -1.
Global-auto-size if also menu_height/list_height = 0.