macOS menu bar: enable the emoji & keyboard viewer icon

Snippet from a login script: if the input menu isn’t visible yet, it adds the emoji & symbols viewer, the keyboard viewer and the Austrian keyboard layout, then shows the input menu in the menu bar.

# check if emoji and keyboard setting is active
SYSUI=$(defaults read /Users/student/Library/Preferences/com.apple.systemuiserver "NSStatusItem Visible com.apple.menuextra.textinput" 2>&1)
if [ "$SYSUI" == "1" ]; then
    echo "setting existing..."
else
    # emoji & keyboard viewer & keyboard layout Austria
    defaults write /Users/student/Library/Preferences/com.apple.HIToolbox AppleEnabledInputSources -array-add '<dict><key>Bundle ID</key><string>com.apple.CharacterPaletteIM</string><key>InputSourceKind</key><string>Non Keyboard Input Method</string></dict>'
    defaults write /Users/student/Library/Preferences/com.apple.HIToolbox AppleEnabledInputSources -array-add '<dict><key>Bundle ID</key><string>com.apple.KeyboardViewer</string><key>InputSourceKind</key><string>Non Keyboard Input Method</string></dict>'
    defaults write /Users/student/Library/Preferences/com.apple.HIToolbox AppleEnabledInputSources -array-add '<dict><key>InputSourceKind</key><string>Keyboard Layout</string><key>KeyboardLayout ID</key><integer>92</integer><key>KeyboardLayout Name</key><string>Austrian</string></dict>'

    defaults write /Users/student/Library/Preferences/com.apple.systemuiserver "NSStatusItem Visible com.apple.menuextra.textinput" -bool TRUE
    defaults write /Users/student/Library/Preferences/com.apple.systemuiserver menuExtras -array-add "/System/Library/CoreServices/Menu Extras/TextInput.menu"

    chown ws:staff /Users/student/Library/Preferences/com.apple.systemuiserver.plist
    chown ws:staff /Users/student/Library/Preferences/com.apple.HIToolbox.plist

    killall -KILL cfprefsd
    killall -KILL SystemUIServer
fi