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hi a i am using ubuntu 16.04 LTS if anybody can help me with this, i want my webcam to take snaps of the person who is trying to enter my computer.it would be best if someone try to explain it in scripting language.i would like to make it a cron job so it can automatically when system is boot up.

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You can use the motion package to take pictures of moving objects seen by your webcam.

motion - V4L capture program supporting motion detection

Start motion as you leave your computer.

There is no way to get the login program to "do something" on single password failures.

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