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Answer
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The TMOUT variable sets an inactivity timer at the command prompt level; it doesn't affect user input.
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Fri Sep 2 07:21:24 2011 why? BlackDragon
The newer shells in the sh family (e.g., ksh and bash) provide a timeout
variable, TMOUT, that can be used to end idle sessions. If TMOUT is set
to any value greater than 0, the shell will end after a prescribed number
of seconds have passed without command activity.
Two of the most popular shells, ksh and bash, provide the TMOUT
variable, but process the TMOUT limit a bit differently. Bash counts down
and exits the shell after $TMOUT seconds. Ksh, on the other hand, counts
down $TMOUT seconds, warns the user about the impending timeout and then
waits an additional 60 seconds before exiting the shell.
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