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138,390
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grub2
Link:
🔍 See Original Answer on Ask Ubuntu ⧉ 🔗
URL:
https://askubuntu.com/q/1022706
Title:
How to list GRUB's "menuentries" in command-line?
ID:
/2018/04/07/How-to-list-GRUB_s-_menuentries_-in-command-line_
Created:
April 7, 2018
Edited: July 27, 2019
Upload:
April 8, 2024
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Color Screen shot (short version)
Use mouse scroll wheel, Home, End, PgUp, PgDn, ↑ and ↓ keys to navigate the menu.
Table of Contents
- Color Screen shot (short version)
- Text Screen shot (long version)
- Highlight entry and press Enter
- !/bin/bash
- NAME: grub-menu.sh
- PATH: $HOME/bin
- DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
- DATE: Apr 5, 2018. Modified: July 27, 2019
- UPDT: Scroll bar was outside of dialog box. Move windo border line.
- $TERM variable may be missing when called via desktop shortcut
- Send output to secondary terminal such that previous history isn’t cleared on exit
- Default for hide duplicate and triplicate options with (upstart) and (recovery mode)?
- Major / Minor internal grub submenu numbers, ie
1>0,1>1,1>2, etc. - Restore output to primary terminal
Text Screen shot (long version)
The bash script uses whiptail instead of dialog to display the menu. One advantage is you can copy the terminal image to the clipboard as
text and paste it into this website as text. Other advantages include:
- Mouse scroll wheel support
- Faster performance
dialogis not installed by default in Ubuntu Server or Lubuntu.whiptailis included by default.
Here’s a text screen shot:
Grub Version: 2.02~beta2-36ubuntu3.15
┌─────────┤ Use arrow, page, home & end keys. Tab toggle option ├──────────┐
│ Menu No. --------------- Menu Name --------------- │
│ │
│ 0 Ubuntu ↑ │
│ 1 Advanced options for Ubuntu ▮ │
│ 1>0 Ubuntu, with Linux 4.14.31-041431-generic ▒ │
│ 1>1 Ubuntu, with Linux 4.14.31-041431-generic (upstart) ▒ │
│ 1>2 Ubuntu, with Linux 4.14.31-041431-generic (recovery mode) ▒ │
│ 1>3 Ubuntu, with Linux 4.14.30-041430-generic ▒ │
│ 1>4 Ubuntu, with Linux 4.14.30-041430-generic (upstart) ▒ │
│ 1>5 Ubuntu, with Linux 4.14.30-041430-generic (recovery mode) ▒ │
│ 1>6 Ubuntu, with Linux 4.14.27-041427-generic ▒ │
│ 1>7 Ubuntu, with Linux 4.14.27-041427-generic (upstart) ▒ │
│ 1>8 Ubuntu, with Linux 4.14.27-041427-generic (recovery mode) ▒ │
│ 1>9 Ubuntu, with Linux 4.14.24-041424-generic ▒ │
│ 1>10 Ubuntu, with Linux 4.14.24-041424-generic (upstart) ▒ │
│ 1>11 Ubuntu, with Linux 4.14.24-041424-generic (recovery mode) ▒ │
│ 1>12 Ubuntu, with Linux 4.14.23-041423-generic ▒ │
│ 1>13 Ubuntu, with Linux 4.14.23-041423-generic (upstart) ↓ │
│ │
│ │
│ <Display Grub Boot> <Exit> │
│ │
└──────────────────────────────────────────────────────────────────────────┘
Highlight entry and press Enter
Use the navigation keys to highlight an option and press Enter to see the pre-kernel drivers loaded by grub and the boot parameters passed by grub to the kernel when booting it:
menuentry 'Ubuntu, with Linux 4.14.27-041427-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.14.27-041427-generic-advanced-f3f8e7bc-b337-4194-88b8-3a513f6be55b' {
recordfail
savedefault
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root f3f8e7bc-b337-4194-88b8-3a513f6be55b
else
search --no-floppy --fs-uuid --set=root f3f8e7bc-b337-4194-88b8-3a513f6be55b
fi
echo 'Loading Linux 4.14.27-041427-generic ...'
linux /boot/vmlinuz-4.14.27-041427-generic root=UUID=f3f8e7bc-b337-4194-88b8-3a513f6be55b ro quiet splash loglevel=0 vga=current udev.log-priority=3 fastboot kaslr acpiphp.disable=1 crashkernel=384M-2G:128M,2G-:256M $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.14.27-041427-generic
}
Press <Enter> to continue
## ```
#`grub-menu.sh` bash script
`grub-menu.sh` only has one option to tweak:
``` bash
<a id="hdr5"></a>
<div class="hdr-bar"> <a href="#">Top</a> <a href="#hdr4">ToS</a> <a href="#hdr2">ToC</a> <a href="#hdr6">Skip</a></div>
# Default for hide duplicate and triplicate options with (upstart) and (recovery mode)?
HideUpstartRecovery=false
Set the value to true (hide the extra entries) or false (list all entries).
The default format can be overridden when calling the script using:
grub-menu.sh short
or:
grub-menu.sh long
The code:
``` bash
!/bin/bash
NAME: grub-menu.sh
PATH: $HOME/bin
DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
DATE: Apr 5, 2018. Modified: July 27, 2019
UPDT: Scroll bar was outside of dialog box. Move windo border line.
$TERM variable may be missing when called via desktop shortcut
CurrentTERM=$(env | grep TERM) if [[ $CurrentTERM == “” ]] ; then notify-send –urgency=critical “$0 cannot be run from GUI without TERM environment variable.” exit 1 fi
Send output to secondary terminal such that previous history isn’t cleared on exit
tput smcup
AllMenusArr=() # All menu options.
Default for hide duplicate and triplicate options with (upstart) and (recovery mode)?
HideUpstartRecovery=false
if [[ $1 == short ]] ; then
HideUpstartRecovery=true # override default with first passed parameter “short”
elif [[ $1 == long ]] ; then
HideUpstartRecovery=false # override default with first passed parameter “long”
fi
SkippedMenuEntry=false # Don’t change this value, automatically maintained
InSubMenu=false # Within a line beginning with submenu?
InMenuEntry=false # Within a line beginning with menuentry and ending in {?
NextMenuEntryNo=0 # Next grub internal menu entry number to assign
Major / Minor internal grub submenu numbers, ie 1>0, 1>1, 1>2, etc.
ThisSubMenuMajorNo=0 NextSubMenuMinorNo=0 CurrTag=”” # Current grub internal menu number, zero based CurrText=”” # Current grub menu option text, ie “Ubuntu”, “Windows…”, etc. SubMenuList=”” # Only supports 10 submenus! Numbered 0 to 9. Future use.
while read -r line; do # Example: “ }” BlackLine=”${line//[[:blank:]]/}” # Remove all whitespace if [[ $BlackLine == “}” ]] ; then # Add menu option in buffer if [[ $SkippedMenuEntry == true ]] ; then NextSubMenuMinorNo=$(( $NextSubMenuMinorNo + 1 )) SkippedMenuEntry=false continue fi if [[ $InMenuEntry == true ]] ; then InMenuEntry=false if [[ $InSubMenu == true ]] ; then NextSubMenuMinorNo=$(( $NextSubMenuMinorNo + 1 )) else NextMenuEntryNo=$(( $NextMenuEntryNo + 1 )) fi elif [[ $InSubMenu == true ]] ; then InSubMenu=false NextMenuEntryNo=$(( $NextMenuEntryNo + 1 )) else continue # Future error message? fi # Set maximum CurrText size to 68 characters. CurrText=”${CurrText:0:67}” AllMenusArr+=($CurrTag “$CurrText”) fi
# Example: "menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu" ...
# "submenu 'Advanced options for Ubuntu' $menuentry_id_option" ...
if [[ $line == submenu* ]] ; then
# line starts with `submenu`
InSubMenu=true
ThisSubMenuMajorNo=$NextMenuEntryNo
NextSubMenuMinorNo=0
SubMenuList=$SubMenuList$ThisSubMenuMajorNo
CurrTag=$NextMenuEntryNo
CurrText="${line#*\'}"
CurrText="${CurrText%%\'*}"
AllMenusArr+=($CurrTag "$CurrText") # ie "1 Advanced options for Ubuntu"
elif [[ $line == menuentry* ]] && [[ $line == *"{"* ]] ; then
# line starts with `menuentry` and ends with `{`
if [[ $HideUpstartRecovery == true ]] ; then
if [[ $line == *"(upstart)"* ]] || [[ $line == *"(recovery mode)"* ]] ; then
SkippedMenuEntry=true
continue
fi
fi
InMenuEntry=true
if [[ $InSubMenu == true ]] ; then
: # In a submenu, increment minor instead of major which is "sticky" now.
CurrTag=$ThisSubMenuMajorNo">"$NextSubMenuMinorNo
else
CurrTag=$NextMenuEntryNo
fi
CurrText="${line#*\'}"
CurrText="${CurrText%%\'*}"
else
continue # Other stuff - Ignore it.
fi
done < /boot/grub/grub.cfg
LongVersion=$(grub-install –version) ShortVersion=$(echo “${LongVersion:20}”) DefaultItem=0
if [[ $HideUpstartRecovery == true ]] ; then MenuText=”Menu No. ———– Menu Name ———–” else MenuText=”Menu No. ————— Menu Name —————” fi
while true ; do
Choice=$(whiptail --clear \
--title "Use arrow, page, home & end keys. Tab toggle option" \
--backtitle "Grub Version: $ShortVersion" \
--ok-button "Display Grub Boot" \
--cancel-button "Exit" \
--default-item "$DefaultItem" \
--menu "$MenuText" 24 80 16 \
"${AllMenusArr[@]}" \
2>&1 >/dev/tty)
clear
if [[ $Choice == "" ]]; then break ; fi
DefaultItem=$Choice
for (( i=0; i < ${#AllMenusArr[@]}; i=i+2 )) ; do
if [[ "${AllMenusArr[i]}" == $Choice ]] ; then
i=$i+1
MenuEntry="menuentry '"${AllMenusArr[i]}"'"
break
fi
done
TheGameIsAfoot=false
while read -r line ; do
if [[ $line = *"$MenuEntry"* ]]; then TheGameIsAfoot=true ; fi
if [[ $TheGameIsAfoot == true ]]; then
echo $line
if [[ $line = *"}"* ]]; then break ; fi
fi
done < /boot/grub/grub.cfg
read -p "Press <Enter> to continue"
done
Restore output to primary terminal
tput rmcup
exit 0