6.2 File System Hierarchy

The file system hierarchy in Tru64 UNIX version 5 has been modified slightly from the version 4 layout.

The version 5 file system layout is illustrated in Figure 6-4. The root (/), /usr, and /var directories have a new directory, named /cluster, added to each directory. Underneath each cluster directory is the members directory. The members directory is where the member-specific directories will be located. As you can see by the figure, each members directory currently contains two files:

member
member0

click to expand
Figure 6-4: File System Hierarchy (V5+)

The member0 file is the standalone system's member-specific directory, while the member file is a member-neutral identity link, a CDSL, to allow you to get to that member's member-specific directory quickly.

 # for i in / /usr /var > do > cd ${i}/cluster/members > print "\n[${PWD}]" > ls -ld * > done [/cluster/members] lrwxr-xr-x       1 root         system              6 Jan 26 08:46 member -> {memb} drwxr-xr-x       9 root         system           8192 Feb 6 18:41 member0 [/usr/cluster/members] lrwxr-xr-x       1 root         system              6 Jan 26 08:47 member -> {memb} drwxr-xr-x       7 root         system           8192 Jan 26 08:47 member0 [/var/cluster/members] lrwxr-xr-x       1 root         system              6 Jan 26 08:51 member -> {memb} drwxr-xr-x      22 root         system           8192 Feb 6 17:02 member0

The other CDSL in the diagram is a hidden file in the root (/) directory called ".local..".

 # ls -l /.local.. | awk '{ print $9,$10,$11 }' /.local.. -> cluster/members/{memb}

This example illustrates a quick way to show a file name and its link. Since this command will come in handy throughout this chapter (and the rest of the book), let's create a function to use this command so you can save on typing. To make this change even more permanent, you can place it in your ".profile" file. Note: this particular function works in the Korn shell.

 # function fln > { > ls -l $@ | awk '{ print $9,$10,$11 }' > }

 # fln /.local.. /.local.. -> cluster/members/{memb}

To see the hierarchy information for the Tru64 UNIX version on your system, see the hier(5) reference page.