If you boot in single-user mode, no mounts will be made, though the root partition will be available read only (it will be the "a" partition on booted device, most likely wd0). To boot in single user mode, use "-s" at the boot> prompt.
Mount points vary. Once you reach the shell, issue the following commands (assuming wd0 is the device, and /etc is in the root partition):
# export TERM=vt220
# mount /dev/wd0a /
# cat /etc/fstab
(Look for your /usr partition, this example will assume you see it as /dev/sd0f. Change accordingly.)
# mount /dev/wd0f /usr
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From here, you can use vi(1) or mg(1) or sed(1) to edit the file.
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