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Unset TMOUT or set it to 0 in order to prevent shell autologout. TMOUT is the number of seconds after which the present shell will be killed if it has been idle for that long.
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nice
that's a good trick. GNU screen also helps to keep sessions alive as well. http://www.gnu.org/software/screen/
sorry for the blank comment above ^^^.
Screen doesn't help autolog out from root, for example, which is the type of thing I think the OP was trying to solve.
My thoughts anyway.
It doesn't work if TMOUT is set like:
declare -r TMOUT=600