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    Command Linux
    Home - man page - SYSCTL.CONF

    SYSCTL.CONF

    WillieBy WillieFebruary 3, 2026Updated:February 3, 2026No Comments1 Min Read

    NAME

    sysctl.conf – sysctl preload/configuration file  

    DESCRIPTION

    sysctl.conf is a simple file containing sysctl values to be read in and set by sysctl. The syntax is simply as follows:

    # comment
    ; comment
    
    token = value
    

    Note that blank lines are ignored, and whitespace before and after a token or value is ignored, although a value can contain whitespace within. Lines which begin with a # or ; are considered comments and ignored.  

    EXAMPLE

    # sysctl.conf sample
    #
      kernel.domainname = example.com
    ; this one has a space which will be written to the sysctl!
      kernel.modprobe = /sbin/mod probe
    

     

    FILES

    /run/sysctl.d/*.conf
    /etc/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf The paths where sysctl preload files usually exit. See also sysctl option –system.

    AUTHOR

    George Staikos  

    REPORTING BUGS

    Please send bug reports to

    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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