11-29-2017
No output mean that there are no difference. Any differences would be displayed to the screen, or you could choose to direct them to a file as usual.
As for the return code, a zero value of $? indicates that there are differences and a value of one indicates that the files match.
I presume that these are quite large files if they take 3 minutes to work through. I know that there can be performance issues with grep and the -f flag with files over a certain size. is this time critical?
I hope that this helps,
Robin
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LEARN ABOUT CENTOS
binfmt.d
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 binfmt_misc.txt[1] 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.
Each configuration file shall be named in the style of program.conf. Files in /etc/ override files with the same name in /usr/lib/ and
/run/. Files in /run/ override files with the same name in /usr/lib/. Packages should install their configuration files in /usr/lib/, files
in /etc/ are reserved for the local administrator, who may use this logic to override the configuration files installed from vendor
packages. All files are sorted by their filename in lexicographic order, regardless of which of the directories they reside in. If multiple
files specify the same binary type name, the entry in the file with the lexicographically latest name will be applied.
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 /etc/binfmt.d/ bearing the same filename.
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.txt
https://www.kernel.org/doc/Documentation/binfmt_misc.txt
systemd 208 BINFMT.D(5)