The /var directory contains files that change sizes during normal operation. Several files and subdirectories in the /var directory have been added, removed, or changed.
The /var/opt/packagename directory contains software package objects that change sizes, such as log and spool files.
The /var/sadm directory contains databases maintained by the software package management utilities.
The /var/saf directory contains Service Access Facility (SAF) logging and accounting files.
The SunOS release 4 /var/spool/mail directory has been moved to /var/mail.
Two directories were added to the SunOS release 5 file system: /kernel and /opt.