A menu box
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- A menu box display a list of choices to the user in the form of a menu.
- Each menu is made of a tag string and an item string. In this example, a tag (e.g., Calendar) is on left side and an item (e.g., "Displays a calendar") is on right side:
Date/time "Displays date and time" \ Calendar "Displays a calendar" \ Editor "Start a text editor" \ Exit "Exit to the shell"
- The tag gives the entry a name to distinguish it from the other entries in the menu. Use the tag to make decision using if statement or case..esac statement.
- The item is nothing but a short description of the option that the entry represents.
- All choices (menus) are displayed in the order given.
- On exit the tag of the chosen menu entry will be printed on dialog’s output. This can be redirected to the file using the following syntax:
> /tmp/menu.output
- If the "--help-button" option is given, the corresponding help text will be printed if the user selects the help button.
Example
- Create a shell script called utilitymenu.sh:
#!/bin/bash
# utilitymenu.sh - A sample shell script to display menus on screen
# Store menu options selected by the user
INPUT=/tmp/menu.sh.$$
# Storage file for displaying cal and date command output
OUTPUT=/tmp/output.sh.$$
# get text editor or fall back to vi_editor
vi_editor=${EDITOR-vi}
# trap and delete temp files
trap "rm $OUTPUT; rm $INPUT; exit" SIGHUP SIGINT SIGTERM
#
# Purpose - display output using msgbox
# $1 -> set msgbox height
# $2 -> set msgbox width
# $3 -> set msgbox title
#
function display_output(){
local h=${1-10} # box height default 10
local w=${2-41} # box width default 41
local t=${3-Output} # box title
dialog --backtitle "Linux Shell Script Tutorial" --title "${t}" --clear --msgbox "$(<$OUTPUT)" ${h} ${w}
}
#
# Purpose - display current system date & time
#
function show_date(){
echo "Today is $(date) @ $(hostname -f)." >$OUTPUT
display_output 6 60 "Date and Time"
}
#
# Purpose - display a calendar
#
function show_calendar(){
cal >$OUTPUT
display_output 13 25 "Calendar"
}
#
# set infinite loop
#
while true
do
### display main menu ###
dialog --clear --help-button --backtitle "Linux Shell Script Tutorial" \
--title "[ M A I N - M E N U ]" \
--menu "You can use the UP/DOWN arrow keys, the first \n\
letter of the choice as a hot key, or the \n\
number keys 1-9 to choose an option.\n\
Choose the TASK" 15 50 4 \
Date/time "Displays date and time" \
Calendar "Displays a calendar" \
Editor "Start a text editor" \
Exit "Exit to the shell" 2>"${INPUT}"
menuitem=$(<"${INPUT}")
# make decsion
case $menuitem in
Date/time) show_date;;
Calendar) show_calendar;;
Editor) $vi_editor;;
Exit) echo "Bye"; break;;
esac
done
# if temp files found, delete em
[ -f $OUTPUT ] && rm $OUTPUT
[ -f $INPUT ] && rm $INPUT
Save and close the file. Run it as follows:
chmod +x utilitymenu.sh
./utilitymenu.sh
Sample outputs:
- utilitymenu.sh shell script output (dialog command with menus)