模拟显示 grub 启动菜单

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模拟显示 grub 启动菜单
来源:https://askubuntu.com/questions/1019213/display-grub-menu-and-options-without-rebooting
grub-menu.sh – bash script
#!/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: May 7, 2018.
# $TERM variable may be missing when called via desktop shortcut
CurrentTERM=$(env | grep TERM)
if [[$CurrentTERM == ""]] ; then
notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
exit 1
fi
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
–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 "$MenuText" 24 76 16
"${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
exit 0 复制代码

grub-display.sh – bash script – Ubuntu Desktop
#!/bin/bash
# NAME: grub-display.sh
# PATH: $HOME/bin
# DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
# DATE: Mar 24, 2018. Modified: Mar 26, 2018.
# $TERM variable may be missing when called via desktop shortcut
CurrentTERM=$(env | grep TERM)
if [[$CurrentTERM == ""]] ; then
notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
exit 1
fi
# Must have the dialog package. On Servers, not installed by default
command -v dialog >/dev/null 2>&1 || {echo >&2 "dialog package required but it is not installed.Aborting."; exit 99;}
# Version without upstart and recovery options displayed
#awk -F’ ‘/menuentry / {print i++, $2}’ /boot/grub/grub.cfg
# | grep -v upstart | grep -v recovery > ~/.grub-display-menu
# Version with upstart and recovery options displayed
awk -F’ ‘/menuentry / {print i++, $2}’ /boot/grub/grub.cfg
> ~/.grub-display-menu
MenuArr=()
while read -r line; do
MenuNmbr=${line%% *}
MenuName=${line#*}
MenuArr+=($MenuNmbr "$MenuName")
done < ~/.grub-display-menu
rm ~/.grub-display-menu
LongVersion=$(grub-install –version)
ShortVersion=$(echo "${LongVersion:20}")
DefaultItem=0
while true ; do
Choice=$(dialog
–title "Use arrow, page, home & end keys. Tab toggle option"
–backtitle "Grub Version: $ShortVersion"
–ok-label "Display Grub Boot"
–cancel-label "Exit"
–default-item "$DefaultItem"
–menu "Menu Number ———– Menu Name ———-" 24 76 16
"${MenuArr[@]}"
>/dev/tty)
clear
if [[$Choice == ""]]; then break ; fi
DefaultItem=$Choice
for ((i=0; i < ${#MenuArr[@]}; i=i+2 )) ; do
if [["${MenuArr[i]}" == $Choice ]] ; then
i=$i+1
MenuEntry="menuentry ‘"${MenuArr[i]}"’"
break
fi
done
TheGameIsAfoot=false
while read -r line ; do
if [[$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
exit 0 复制代码
grub-display-lite.sh – bash script – Ubuntu Server
#!/bin/bash
# NAME: grub-display-lite.sh
# PATH: $HOME/bin
# DESC: Written for AU Q&A: https://askubuntu.com/q/1019213/307523
# DATE: Mar 26, 2018.
# NOTE: "lite" version written for Ubuntu Server and Lubuntu which do
# not have `dialog` installed by default. `whiptail` is used
# instead. Nice consequences are better resolution, mouse scroll
# wheel and copy to clipboard support.
# $TERM variable may be missing when called via desktop shortcut
CurrentTERM=$(env | grep TERM)
if [[$CurrentTERM == ""]] ; then
notify-send –urgency=critical "$0 cannot be run from GUI without TERM environment variable."
exit 1
fi
# Version without upstart and recovery options displayed
awk -F’ ‘/menuentry / {print i++, $2}’ /boot/grub/grub.cfg
| grep -v upstart | grep -v recovery > ~/.grub-display-menu
# Version with upstart and recovery options displayed
#awk -F’ ‘/menuentry / {print i++, $2}’ /boot/grub/grub.cfg
# > ~/.grub-display-menu
MenuArr=()
while read -r line; do
MenuNmbr=${line%% *}
MenuName=${line#*}
MenuArr+=($MenuNmbr "$MenuName")
done < ~/.grub-display-menu
rm ~/.grub-display-menu
LongVersion=$(grub-install –version)
ShortVersion=$(echo "${LongVersion:20}")
DefaultItem=0
while true ; do
Choice=$(whiptail
–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 "Menu Number ———– Menu Name ———-" 24 76 16
"${MenuArr[@]}"
>/dev/tty)
clear
if [[$Choice == ""]]; then break ; fi
DefaultItem=$Choice
for ((i=0; i < ${#MenuArr[@]}; i=i+2 )) ; do
if [["${MenuArr[i]}" == $Choice ]] ; then
i=$i+1
MenuEntry="menuentry ‘"${MenuArr[i]}"’"
break
fi
done
TheGameIsAfoot=false
while read -r line ; do
if [[$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
exit 0 复制代码 TUI 玩出花来了

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