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close [-slave] [-onexec 0|1] [-i spawn_id]
Arguments Description
-i spawn_id declares the process to close corresponding to the named spawn_id.
-onexec determines whether the spawn id will be closed in any new spawned processes or if the process is overlayed.  To leave a spawn id open, use the value 0.
-slave Close slave of process.

Closes the connection to the current process. Most interactive programs will detect EOF on their stdin and exit; thus close usually suffices to kill the process as well. 

Both expect and interact will detect when the current process exits and implicitly do a close.  But if you kill the process by, say, "exec kill $pid”, you will need to explicitly call close. 

The -onexec flag determines whether the spawn id will be closed in any new spawned processes or if the process is overlayed.  To leave a spawn id open, use the value 0.  A non-zero integer value will force the spawn closed (the default) in any new processes. 

The -slave flag closes the slave associated with the spawn id.  (See “spawn -pty”.) When the connection is closed, the slave is automatically closed as well if still open. 

No matter whether the connection is closed implicitly or explicitly, you should call wait to clear up the corresponding kernel process slot.  close does not call wait since there is no guarantee that closing a process connection will cause it to exit. 


This material is excerpted from the O'Reilly book "Exploring Expect" by Don Libes, and can also be found in the manpage on many UNIX platforms. 
 

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