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'\" t
.TH "BINFMT\&.D" "5" "" "systemd 241" "binfmt.d"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
binfmt.d \- Configure additional binary formats for executables at boot
.SH "SYNOPSIS"
.PP
/etc/binfmt\&.d/*\&.conf
.PP
/run/binfmt\&.d/*\&.conf
.PP
/usr/lib/binfmt\&.d/*\&.conf
.SH "DESCRIPTION"
.PP
At boot,
\fBsystemd-binfmt.service\fR(8)
reads configuration files from the above directories to register in the kernel additional binary formats for executables\&.
.SH "CONFIGURATION FORMAT"
.PP
Each file contains a list of binfmt_misc kernel binary format rules\&. Consult the kernel\*(Aqs
\m[blue]\fBbinfmt\-misc\&.rst\fR\m[]\&\s-2\u[1]\d\s+2
documentation file for more information on registration of additional binary formats and how to write rules\&.
.PP
Empty lines and lines beginning with ; and # are ignored\&. Note that this means you may not use ; and # as delimiter in binary format rules\&.
.SH "CONFIGURATION DIRECTORIES AND PRECEDENCE"
.PP
Configuration files are read from directories in
/etc/,
/run/, and
/lib/, in order of precedence\&. Each configuration file in these configuration directories shall be named in the style of
\fIfilename\fR\&.conf\&. Files in
/etc/
override files with the same name in
/run/
and
/lib/\&. Files in
/run/
override files with the same name in
/lib/\&.
.PP
Packages should install their configuration files in
/lib/\&. Files in
/etc/
are reserved for the local administrator, who may use this logic to override the configuration files installed by vendor packages\&. 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\&. It is recommended to prefix all filenames with a two\-digit number and a dash, to simplify the ordering of the files\&.
.PP
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\&.
.SH "EXAMPLE"
.PP
\fBExample\ \&1.\ \&/etc/binfmt\&.d/wine\&.conf example:\fR
.sp
.if n \{\
.RS 4
.\}
.nf
# Start WINE on Windows executables
:DOSWin:M::MZ::/usr/bin/wine:
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsystemd-binfmt.service\fR(8),
\fBsystemd-delta\fR(1),
\fBwine\fR(8)
.SH "NOTES"
.IP " 1." 4
binfmt-misc.rst
.RS 4
\%https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
.RE
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