auto delete files from yesterday

    My webcam does save the files on the usb from the Linux server.
    i have put in the following command:
    rm /volumeUSB1/usbshare/*.mp4


    Each day he does remove all the files.
    But i want him 2 remove only the files from yesterday.
    the files are named with date:
    20130331_(current time).mp4


    How can i make this work?


    thanks allready.

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