Some of the changes to file system locations and names are:
The /dev directory has changed from a flat directory to a hierarchical one.
The /etc directory contains system configuration information. Several files and subdirectories have been added, removed, or changed.
The /etc/vfstab tab file replaces /etc/fstab.
The /etc/lp directory replaces /etc/printcap.
The SunOS release 5.7 /sbin directory contains the rc scripts used to alter system run levels as well as the rcs script used to initialize the system prior to mounting file systems.
The SunOS release 5.7 /usr directory contains sharable files and executables provided by the system.
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/mail directory replaces /var/spool/mail.
The terminfo database replaces termcap.