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/sbin/fsckbinary may use bitwise OR to combine exit codes coming from different filesystem-specific fsck binaries; for this operation to make sense, there really should be some common interpretation for these exit codes.fsck.fatnot using these standard codes is a bug, which presumably will be fixed in some future release.fscks you’d use on a root file system do follow the mainfsckexpectations.)fsckjust invokereboot(2)on its own, or send SIGINT to PID 1? The reboot must be for some reason other than 'because I said so'.fsck’s job is to check and fix file systems, not to handle rebooting. Arguably the documentation assumes too much; it would be more accurate to say “2 indicates that a mounted file system was altered” (which in practice means the system should be rebooted).