03-31-2010
Root has the files that go to the / (i.e. root) file system and usr the ones going to /usr which can be a separate, sometimes read-only mounted file system.
Note that this distinction is being deprecated.
For example OpenSolaris has SUNWcs for core Solaris which is a merge of the previous SUNWcsu and SUNWcsr in older releases.
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devnm(1M) System Administration Commands devnm(1M)
NAME
devnm - device name
SYNOPSIS
/usr/sbin/devnm name [name...]
DESCRIPTION
The devnm command identifies the special file associated with the mounted file system where the argument name resides. One or more name can
be specified.
EXAMPLES
Example 1: Using the devnm Command
Assuming that /usr is mounted on /dev/dsk/c0t3d0s6, the following command :
/usr/sbin/devnm /usr
produces:
/dev/dsk/c0t3d0s6 /usr
FILES
/dev/dsk/*
/etc/mnttab
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
mnttab(4), attributes(5)
SunOS 5.10 14 Sep 1992 devnm(1M)