SCCS and RCS over NFS (was: Creating a lock file in sh?)

[Chip Salzenberg]

According to eggert at twinsun.com (Paul Eggert):
>For example (Bourne shell):
>
>	if (umask 777;  echo >lock)
>	then
>		Perform whatever operation required locking.
>		rm -f lock
>	else
>		Report that you could not obtain the lock.
>	fi

Unfortunately, this method is still prone to spurious failure when an
imperfect network loses the ACK from the initial creation attempt.

"NFS: We Bring Net Errors To Life."
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