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 NETBSD
mount_ados
MOUNT_ADOS(8) BSD System Manager's Manual MOUNT_ADOS(8)
NAME
mount_ados -- mount an AmigaDOS file system
SYNOPSIS
mount_ados [-o options] [-u uid] [-g gid] [-m mask] special node
DESCRIPTION
The mount_ados command attaches the AmigaDOS filesystem residing on the device special to the global filesystem namespace at the location
indicated by node. Both special and node are converted to absolute paths before use. This command is normally executed by mount(8) at boot
time, but can be used by any user to mount an AmigaDOS file system on any directory that they own (provided, of course, that they have appro-
priate access to the device that contains the file system).
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.
SEE ALSO
mount(2), unmount(2), fstab(5), mount(8)
HISTORY
The mount_ados utility first appeared in NetBSD 1.0.
BUGS
The 'ados' filesystem currently supports the Amiga fast file system.
The 'ados' filesystem implementation currently is read-only. The mount_ados utility silently retries the mount read-only, as if the ro
option were specified, when it encounters the [EROFS] error.
BSD
April 7, 1994 BSD