How can I create a select menu in a shell script?

#!/bin/bash
# Bash Menu Script Example

PS3='Please enter your choice: '
options=("Option 1" "Option 2" "Option 3" "Quit")
select opt in "${options[@]}"
do
    case $opt in
        "Option 1")
            echo "you chose choice 1"
            ;;
        "Option 2")
            echo "you chose choice 2"
            ;;
        "Option 3")
            echo "you chose choice $REPLY which is $opt"
            ;;
        "Quit")
            break
            ;;
        *) echo "invalid option $REPLY";;
    esac
done

Add break statements wherever you need the select loop to exit. If a break is not performed, the select statement loops and the menu is re-displayed.

In the third option, I included variables that are set by the select statement to demonstrate that you have access to those values. If you choose it, it will output:

you chose choice 3 which is Option 3

You can see that $REPLY contains the string you entered at the prompt. It is used as an index into the array ${options[@]} as if the array were 1 based. The variable $opt contains the string from that index in the array.

Note that the choices could be a simple list directly in the select statement like this:

select opt in foo bar baz 'multi word choice'

but you can't put such a list in a scalar variable because of the spaces in one of the choices.

You can also use file globbing if you are choosing among files:

select file in *.tar.gz

Using dialog, the command would look like this:

dialog --clear --backtitle "Backtitle here" --title "Title here" --menu "Choose one of the following options:" 15 40 4 \
1 "Option 1" \
2 "Option 2" \
3 "Option 3"

Putting it in a script:

#!/bin/bash

HEIGHT=15
WIDTH=40
CHOICE_HEIGHT=4
BACKTITLE="Backtitle here"
TITLE="Title here"
MENU="Choose one of the following options:"

OPTIONS=(1 "Option 1"
         2 "Option 2"
         3 "Option 3")

CHOICE=$(dialog --clear \
                --backtitle "$BACKTITLE" \
                --title "$TITLE" \
                --menu "$MENU" \
                $HEIGHT $WIDTH $CHOICE_HEIGHT \
                "${OPTIONS[@]}" \
                2>&1 >/dev/tty)

clear
case $CHOICE in
        1)
            echo "You chose Option 1"
            ;;
        2)
            echo "You chose Option 2"
            ;;
        3)
            echo "You chose Option 3"
            ;;
esac

Not a new answer per se, but since there's no accepted answer yet, here are a few coding tips and tricks, for both select and zenity:

title="Select example"
prompt="Pick an option:"
options=("A" "B" "C")

echo "$title"
PS3="$prompt "
select opt in "${options[@]}" "Quit"; do 
    case "$REPLY" in
    1) echo "You picked $opt which is option 1";;
    2) echo "You picked $opt which is option 2";;
    3) echo "You picked $opt which is option 3";;
    $((${#options[@]}+1))) echo "Goodbye!"; break;;
    *) echo "Invalid option. Try another one.";continue;;
    esac
done

while opt=$(zenity --title="$title" --text="$prompt" --list \
                   --column="Options" "${options[@]}")
do
    case "$opt" in
    "${options[0]}") zenity --info --text="You picked $opt, option 1";;
    "${options[1]}") zenity --info --text="You picked $opt, option 2";;
    "${options[2]}") zenity --info --text="You picked $opt, option 3";;
    *) zenity --error --text="Invalid option. Try another one.";;
    esac
done

Worth mentioning:

• Both will loop until the user explicitly chooses Quit (or Cancel for zenity). This is a good approach for interactive script menus: after a choice is selected and action performed, menu is presented again for another choice. If choice is meant to be one-time only, just use break after esac (the zenity approach could be further reduced also)

• Both case are index-based, rather than value-based. I think this is easier to code and maintain

• Array is also used for zenity approach.

• "Quit" option is not among the initial, original options. It is "added" when needed, so your array stay clean. Afterall, "Quit" is not needed for zenity anyway, user can just click "Cancel" (or close the window) to exit. Notice how both uses the same, untouched array of options.

• PS3 and REPLY vars can not be renamed. select is hardcoded to use those. All other variables in script (opt, options, prompt, title) can have any names you want, provided you do the adjustments

You can use this simple script for creating options

#!/bin/bash
echo "select the operation ************"
echo "  1)operation 1"
echo "  2)operation 2"
echo "  3)operation 3"
echo "  4)operation 4" 

read n
case $n in
  1) echo "You chose Option 1";;
  2) echo "You chose Option 2";;
  3) echo "You chose Option 3";;
  4) echo "You chose Option 4";;
  *) echo "invalid option";;
esac

I have one more option that is a mixture of these answers but what makes it nice is that you only need to press one key and then the script continues thanks to the -n option of read. In this example, we are prompting to shutdown, reboot, or simply exit the script using ANS as our variable and the user only has to press E, R, or S. I also set the default to exit so if enter is pressed then the script will exit.

#!/bin/bash
read -n 1 -p "Would you like to exit, reboot, or shutdown? (E/r/s) " ans;

case $ans in
    r|R)
        sudo reboot;;
    s|S)
        sudo poweroff;;
    *)
        exit;;
esac

#!/bin/sh
show_menu(){
    normal=`echo "\033[m"`
    menu=`echo "\033[36m"` #Blue
    number=`echo "\033[33m"` #yellow
    bgred=`echo "\033[41m"`
    fgred=`echo "\033[31m"`
    printf "\n${menu}*********************************************${normal}\n"
    printf "${menu}**${number} 1)${menu} Mount dropbox ${normal}\n"
    printf "${menu}**${number} 2)${menu} Mount USB 500 Gig Drive ${normal}\n"
    printf "${menu}**${number} 3)${menu} Restart Apache ${normal}\n"
    printf "${menu}**${number} 4)${menu} ssh Frost TomCat Server ${normal}\n"
    printf "${menu}**${number} 5)${menu} Some other commands${normal}\n"
    printf "${menu}*********************************************${normal}\n"
    printf "Please enter a menu option and enter or ${fgred}x to exit. ${normal}"
    read opt
}

option_picked(){
    msgcolor=`echo "\033[01;31m"` # bold red
    normal=`echo "\033[00;00m"` # normal white
    message=${@:-"${normal}Error: No message passed"}
    printf "${msgcolor}${message}${normal}\n"
}

clear
show_menu
while [ $opt != '' ]
    do
    if [ $opt = '' ]; then
      exit;
    else
      case $opt in
        1) clear;
            option_picked "Option 1 Picked";
            printf "sudo mount /dev/sdh1 /mnt/DropBox/; #The 3 terabyte";
            show_menu;
        ;;
        2) clear;
            option_picked "Option 2 Picked";
            printf "sudo mount /dev/sdi1 /mnt/usbDrive; #The 500 gig drive";
            show_menu;
        ;;
        3) clear;
            option_picked "Option 3 Picked";
            printf "sudo service apache2 restart";
            show_menu;
        ;;
        4) clear;
            option_picked "Option 4 Picked";
            printf "ssh lmesser@ -p 2010";
            show_menu;
        ;;
        x)exit;
        ;;
        \n)exit;
        ;;
        *)clear;
            option_picked "Pick an option from the menu";
            show_menu;
        ;;
      esac
    fi
done

Since this is targeted at Ubuntu you should use whatever backend debconf is configured to use. You can find out the debconf backend with:

sudo -s "echo get debconf/frontend | debconf-communicate"

If it says "dialog" then it likely uses whiptail or dialog. On Lucid it's whiptail.

If that fails, use bash "select" as explained by Dennis Williamson.

Bash fancy menu

Try it out first, then visit my page for detailed description ... No need for external libraries or programs like dialog or zenity ...

#/bin/bash
# by oToGamez
# www.pro-toolz.net

      E='echo -e';e='echo -en';trap "R;exit" 2
    ESC=$( $e "\e")
   TPUT(){ $e "\e[${1};${2}H";}
  CLEAR(){ $e "\ec";}
  CIVIS(){ $e "\e[?25l";}
   DRAW(){ $e "\e%@\e(0";}
  WRITE(){ $e "\e(B";}
   MARK(){ $e "\e[7m";}
 UNMARK(){ $e "\e[27m";}
      R(){ CLEAR ;stty sane;$e "\ec\e[37;44m\e[J";};
   HEAD(){ DRAW
           for each in $(seq 1 13);do
           $E "   x                                          x"
           done
           WRITE;MARK;TPUT 1 5
           $E "BASH SELECTION MENU                       ";UNMARK;}
           i=0; CLEAR; CIVIS;NULL=/dev/null
   FOOT(){ MARK;TPUT 13 5
           printf "ENTER - SELECT,NEXT                       ";UNMARK;}
  ARROW(){ read -s -n3 key 2>/dev/null >&2
           if [[ $key = $ESC[A ]];then echo up;fi
           if [[ $key = $ESC[B ]];then echo dn;fi;}
     M0(){ TPUT  4 20; $e "Login info";}
     M1(){ TPUT  5 20; $e "Network";}
     M2(){ TPUT  6 20; $e "Disk";}
     M3(){ TPUT  7 20; $e "Routing";}
     M4(){ TPUT  8 20; $e "Time";}
     M5(){ TPUT  9 20; $e "ABOUT  ";}
     M6(){ TPUT 10 20; $e "EXIT   ";}
      LM=6
   MENU(){ for each in $(seq 0 $LM);do M${each};done;}
    POS(){ if [[ $cur == up ]];then ((i--));fi
           if [[ $cur == dn ]];then ((i++));fi
           if [[ $i -lt 0   ]];then i=$LM;fi
           if [[ $i -gt $LM ]];then i=0;fi;}
REFRESH(){ after=$((i+1)); before=$((i-1))
           if [[ $before -lt 0  ]];then before=$LM;fi
           if [[ $after -gt $LM ]];then after=0;fi
           if [[ $j -lt $i      ]];then UNMARK;M$before;else UNMARK;M$after;fi
           if [[ $after -eq 0 ]] || [ $before -eq $LM ];then
           UNMARK; M$before; M$after;fi;j=$i;UNMARK;M$before;M$after;}
   INIT(){ R;HEAD;FOOT;MENU;}
     SC(){ REFRESH;MARK;$S;$b;cur=`ARROW`;}
     ES(){ MARK;$e "ENTER = main menu ";$b;read;INIT;};INIT
  while [[ "$O" != " " ]]; do case $i in
        0) S=M0;SC;if [[ $cur == "" ]];then R;$e "\n$(w        )\n";ES;fi;;
        1) S=M1;SC;if [[ $cur == "" ]];then R;$e "\n$(ifconfig )\n";ES;fi;;
        2) S=M2;SC;if [[ $cur == "" ]];then R;$e "\n$(df -h    )\n";ES;fi;;
        3) S=M3;SC;if [[ $cur == "" ]];then R;$e "\n$(route -n )\n";ES;fi;;
        4) S=M4;SC;if [[ $cur == "" ]];then R;$e "\n$(date     )\n";ES;fi;;
        5) S=M5;SC;if [[ $cur == "" ]];then R;$e "\n$($e by oTo)\n";ES;fi;;
        6) S=M6;SC;if [[ $cur == "" ]];then R;exit 0;fi;;
 esac;POS;done

I have used Zenity, which seems always there in Ubuntu, works very well and has many capabilities. This is a sketch of a possible menu:

#! /bin/bash

selection=$(zenity --list "Option 1" "Option 2" "Option 3" --column="" --text="Text above column(s)" --title="My menu")

case "$selection" in
"Option 1")zenity --info --text="Do something here for No1";;
"Option 2")zenity --info --text="Do something here for No2";;
"Option 3")zenity --info --text="Do something here for No3";;
esac

There is already the same question in serverfault answered. The solution there uses whiptail.