I need to unlock my screen using adb, and wait-for-device exits way too early(when the device is booting up), and screen unlock fails. Is there a way to detect that the home screen, so I can fire screen unlock then?

This is the command I am using to unlock screen -

adb wait-for-device shell input keyevent 82

3 Answers 3


well wait-for-device, as you already realized only waits until the adb daemon properly started. This is already at init time. In order to check for a complete boot you cann ad to your script something like:

in pseudo:

  1. wait-for-device
  2. long as getprop sys.boot_completed != 1 sleep some seconds check getprop sys.boot_completed again
  3. shell input keyevent 82

This should work.

Something like this:


adb wait-for-device

A=$(adb shell getprop sys.boot_completed | tr -d '\r')

while [ "$A" != "1" ]; do
        sleep 2
        A=$(adb shell getprop sys.boot_completed | tr -d '\r')

adb shell input keyevent 82

This is not tested so be aware of potential mistakes

  • Please edit your answer to be easily readable. You have a valid answer, but a little clarity would help everyone. Thanks
    – HasH_BrowN
    Commented Sep 30, 2014 at 16:09
  • answer is now edited. Hope this helps you :) Commented Oct 6, 2014 at 14:58
  • good answer +1, now others will be able to follow it. Dont forget to add "Always perform a backup", for those accidental moments;)
    – HasH_BrowN
    Commented Oct 6, 2014 at 16:10
  • 2
    I found that result of getprop had a carriage return after it, so changing the adb command to $(adb shell getprop sys.boot_completed | tr -d '\r') did the trick. This is just trimming out the carriage return character. Commented Jan 5, 2015 at 21:28
  • @divided-by-zero please modify your answer to include the trimming mentioned by CoatedMoose. Umang please accept it as a answer as well. Commented Jun 4, 2015 at 12:26

This is an old question and borderline off-topic but here is how to do it in a single line:

adb wait-for-device shell 'while [[ -z $(getprop sys.boot_completed) ]]; do sleep 1; done; input keyevent 82'

Here's what I came up with:

adb wait-for-device shell <<ENDSCRIPT
echo -n "Waiting for device to boot "
echo "" > /data/local/tmp/zero
getprop dev.bootcomplete > /data/local/tmp/bootcomplete
while cmp /data/local/tmp/zero /data/local/tmp/bootcomplete; do 
    echo -n "."
    sleep 1
    getprop dev.bootcomplete > /data/local/tmp/bootcomplete
}; done
echo "Booted."

echo "Waiting 30 secs for us to be really booted"
sleep 30

echo "Unlocking screen"
adb shell "input keyevent 82"

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