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    Command Linux
    Home - man page - HWCLOCK

    HWCLOCK

    WillieBy WillieApril 24, 2026Updated:April 24, 2026No Comments1 Min Read
     

    NAME

    hwclock – variables that affect the behaviour of the hwclock boot script  

    DESCRIPTION

    The /etc/default/rcS file contains variable settings in POSIX format:
    VAR=VAL

    Only one assignment is allowed per line. Comments (starting with ‘#’) are also allowed.

     

    OPTIONS

    The following variables can be set.

    BADYEAR
    This is used to specify that the hardware clock is incapable of storing years outside the range of 1994-1999. Set to yes if the hardware is broken or no if working correctly.

    HWCLOCKACCESS
    If the hardware clock is not accessible, set to no, in which case hwclock will not be run. Otherwise, set to yes.

    HWCLOCKPARS
    Additional options for hwclock. Unset by default. For example, this may be use to specify the machine hardware clock type for Alphas.

    HCTOSYS_DEVICE
    The hardware clock device you want to use. Defaults to rtc0. It should probably match the CONFIG_RTC_HCTOSYS_DEVICE kernel config option.

     

    Willie
    • Website

    Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.

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