pkgmk(C)
creates a new instance of a package if one already exists
on the device to which it is writing.
It assigns the package an instance identifier.
Use the -o option of
pkgmk
to overwrite an existing instance
of a package rather than to create a new one.
NOTE:
This use of ``instance'' should not be confused with the instance
identifier assigned on installation and referenced in packaging
scripts with the PKGINST variable.
The pkgmk command simply writes the new package to another
directory name, adding characters to the end of the package abbreviation
to distinguish the new package from any instances of the same
package it finds already on the target media.