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How do I ensure that only one instance of my ksh script runs on Solaris using NFS? [duplicate]

Possible Duplicate: What Unix commands can be used as a semaphore/lock? I have read many similar post and the solution seems to be to use flock. flock does not exist on my system and I ...
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How to lock on Solaris 10?

On Linux I use flock lock command to execute a command with an exclusive lock. What is the standard operating system command of Solaris 10 to do the same in a shell?