07-19-2011
I don't know of a command to rest any random file to default file permissions. The system doesn't keep a separate 'default' for each and every file you make. If you screwed up some system files and need to fix it, you're going to have to be more specific about what you did.
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LEARN ABOUT MOJAVE
mount_exfat
MOUNT_EXFAT(8) BSD System Manager's Manual MOUNT_EXFAT(8)
NAME
mount_exfat -- mount an ExFAT file system
SYNOPSIS
mount_exfat [-o options] [-u uid] [-g gid] [-m mask] device directory
DESCRIPTION
The mount_exfat command mounts the ExFAT filesystem from the device device onto the directory given by directory. This command is normally
invoked by diskarbitrationd(8) as the result of detecting a device with a file system recognized as ExFAT. It can also be invoked indirectly
by executing the mount(8) command with the -t exfat option.
The options are as follows:
-o options
Use the specified mount options, as described in mount(8).
-u uid Set the owner of the files in the file system to uid. The default owner is the owner of the directory on which the file system is
being mounted.
-g gid Set the group of the files in the file system to gid. The default group is the group of the directory on which the file system is
being mounted.
-m mask
Specify the maximum file permissions for files in the file system. (For example, a mask of 755 specifies that, by default, the owner
should have read, write, and execute permissions for files, but others should only have read and execute permissions. See chmod(1)
for more information about octal file modes.) Only the nine low-order bits of mask are used. The default mask is taken from the
directory on which the file system is being mounted.
If none of the -u, -g, or -m options are given, the volume will be mounted with the MNT_UNKNOWNPERMISSIONS flag (equivalent to the -o
noowners option).
If the device is internal and not removable, the volume will be mounted with the MNT_ASYNC flag (equivalent to the -o async option) by
default. That default can be overridden with the -o noasync option. When mounted with the -o noasync option, metadata updates are synced to
disk frequently (by default, 50ms after the system call that changed the metadata returns to its caller).
SEE ALSO
fsck_exfat(8), exfat.util(8), mount(2), unmount(2), fstab(5), mount(8)
HISTORY
The mount_exfat utility first appeared in Mac OS X 10.6.3.
Darwin January 19, 2010 Darwin