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BINFMT.D(5)                                  binfmt.d                                 BINFMT.D(5)

NAME
       binfmt.d - Configure additional binary formats for executables at boot

SYNOPSIS
       /etc/binfmt.d/*.conf

       /run/binfmt.d/*.conf

       /usr/lib/binfmt.d/*.conf

DESCRIPTION
       At boot, systemd-binfmt.service(8) reads configuration files from the above directories to
       register in the kernel additional binary formats for executables.

CONFIGURATION FORMAT
       Each file contains a list of binfmt_misc kernel binary format rules. Consult the kernel's
       binfmt-misc.rst[1] documentation file for more information on registration of additional
       binary formats and how to write rules.

       Empty lines and lines beginning with ; and # are ignored. Note that this means you may not
       use ; and # as delimiter in binary format rules.

CONFIGURATION DIRECTORIES AND PRECEDENCE
       Configuration files are read from directories in /etc/, /run/, /usr/local/lib/, and /lib/,
       in order of precedence, as listed in the SYNOPSIS section above. Files must have the the
       ".conf" extension. Files in /etc/ override files with the same name in /run/,
       /usr/local/lib/, and /lib/. Files in /run/ override files with the same name under /usr/.

       All configuration files are sorted by their filename in lexicographic order, regardless of
       which of the directories they reside in. If multiple files specify the same option, the
       entry in the file with the lexicographically latest name will take precedence. Thus, the
       configuration in a certain file may either be replaced completely (by placing a file with
       the same name in a directory with higher priority), or individual settings might be
       changed (by specifying additional settings in a file with a different name that is ordered
       later).

       Packages should install their configuration files in /usr/lib/ (distribution packages) or
       /usr/local/lib/ (local installs). Files in /etc/ are reserved for the local administrator,
       who may use this logic to override the configuration files installed by vendor packages.
       It is recommended to prefix all filenames with a two-digit number and a dash, to simplify
       the ordering of the files.

       If the administrator wants to disable a configuration file supplied by the vendor, the
       recommended way is to place a symlink to /dev/null in the configuration directory in
       /etc/, with the same filename as the vendor configuration file. If the vendor
       configuration file is included in the initrd image, the image has to be regenerated.

EXAMPLE
       Example 1. /etc/binfmt.d/wine.conf example:

           # Start WINE on Windows executables
           :DOSWin:M::MZ::/usr/bin/wine:

SEE ALSO
       systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)

NOTES
        1. binfmt-misc.rst
           https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html

systemd 245                                                                           BINFMT.D(5)

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