Save a command into history immediately

[Paul Y. Peng]

I wonder whether I can tell ESS to save an S-PLUS command into
.S+4history immediately when the command is executed. The default
setting save all commands into the file only when the S-PLUS
session exits normally. If S-PLUS, Emacs or Win98 crashes in the
middle of the session, I lose all commands typed in that session.

I use ess-5.1.11, emacs-20.4, S-PLUS 2000, and Win98. TIA.

Paul.
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