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Operating Systems Solaris Permissions for the root user on Solaris 10 Post 302235469 by jlliagre on Friday 12th of September 2008 02:58:20 AM
Old 09-12-2008
In most cases, yes.

However, root cannot write to a write protected file if the filesystem is mounted read-only or is remote (NFS).
 
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AT&T 3B computer systems included the 3B2, 3B5, 3B15, 3B20S, and 3B4000. These computers were named after the successful 3B20D. The 3B20S (simplex) ran using the UNIX operating system and was developed at Bell Labs and produced by WECo in 1982 for the general purpose internal Bell System use, and later the mini-computer market.
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UMOUNT(8)						    BSD System Manager's Manual 						 UMOUNT(8)

NAME
umount -- unmount filesystems SYNOPSIS
umount [-fv] special | node umount -a | -A [-fv] [-h host] [-t type] DESCRIPTION
The umount command calls the unmount(2) system call to remove a special device or the remote node (rhost:path) from the filesystem tree at the point node. If either special or node are not provided, the appropriate information is taken from the list of filesystems provided by getfsent(3). The options are as follows: -a All the filesystems described via getfsent(3) are unmounted. -A All the currently mounted filesystems except the root are unmounted. -f The filesystem is forcibly unmounted. Active special devices continue to work, but all other files return errors if further accesses are attempted. The root filesystem cannot be forcibly unmounted. -h host Only filesystems mounted from the specified host will be unmounted. This option implies the -A option and, unless otherwise speci- fied with the -t option, will only unmount NFS filesystems. -t type Is used to indicate the actions should only be taken on filesystems of the specified type. More than one type may be specified in a comma separated list. The list of filesystem types can be prefixed with ``no'' to specify the filesystem types for which action should not be taken. For example, the umount command: umount -A -t nfs,hfs umounts all currently-mounted filesystems of the type NFS and HFS. (The -a option only unmounts entries in the /etc/fstab list.) -v Verbose, additional information is printed out as each filesystem is unmounted. NOTES
Due to the complex and interwoven nature of Mac OS X, umount may fail often. It is recommended that diskutil(1) (as in, ``diskutil unmount /mnt'') be used instead. SEE ALSO
unmount(2), getfsent(3), mount(8), diskutil(1) HISTORY
A umount command appeared in Version 6 AT&T UNIX. 4th Berkeley Distribution May 8, 1995 4th Berkeley Distribution

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