从 xinput -list 仅获取设备名称

Question

我编写了一个小程序来切换设备是否启用，主要是通过热键运行以启用/禁用触摸板，因为我的手在打字时总是碰到它。我用它notify-send来创建一个对话框，但是我目前所能做的就是说

device $1 has been enabled

xinput 列表的输出如下所示：

? Virtual core pointer                      id=2    [master pointer  (3)]
?   ? Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
?   ? Atmel Atmel maXTouch Digitizer            id=10   [slave  pointer  (2)]
?   ? ETPS/2 Elantech Touchpad                  id=14   [slave  pointer  (2)]
? Virtual core keyboard                     id=3    [master keyboard (2)]
    ? Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ? Power Button                              id=6    [slave  keyboard (3)]
    ? Video Bus                                 id=7    [slave  keyboard (3)]
    ? Power Button                              id=8    [slave  keyboard (3)]
     ? Sleep Button                             id=9    [slave  keyboard (3)]
    ? USB2.0 HD UVC WebCam                      id=11   [slave  keyboard (3)]
    ? Asus WMI hotkeys                          id=12   [slave  keyboard (3)]
    ? AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]

Is there any easy way to reliably get ETPS/2 Elantech Touchpad or USB2.0 HD UVC WebCam? A regex won't correctly match unless I look for the ? character, something in between, then multiple spaces, but is that a valid character for a regex?

Edit : The script is simple so I've included it, it's called with a device number (would be cool if I could also toggle_device touchpad but that's a later problem)

#!/bin/bash 

DEVICE_ENABLED=`xinput list-props $1 | grep "Enabled" | awk '{print $NF}'`

if [ "$DEVICE_ENABLED" == "1" ] #disable if it's enabled 
    then
    xinput set-prop $1 "Device Enabled" 0
    notify-send "Device $1 has been disabled"
else
    xinput set-prop $1 "Device Enabled" 1
    notify-send "Device $1 has been enabled"
fi

Answer 1

In practice, yes, you can do that.

arrow=$'\xe2\x86\xb3'
while IFS= read -r line; do
  if [[ $line = *"$arrow"* ]]; then
    content=${line#*"$arrow"}  # delete everything before the arrow
    content=${line%%$'\t'*}    # delete everything after first tab
    echo "Found content: $content"
  fi
done < <(xinput --list)

That said, it's easier to call xinput --list --name-only, and not need to filter.