> Who guarantees you that ksh supplies TMOUT? OTOH, TMOUT is not in any
> way restricted, so a user (more likely: a sysadmin) could set and export
> it, and reasonably so: every Posix shell understands it, bash included.
I tested that both ksh and pdksh set TMOUT = 0 at startup, for example:
$ ksh
[033]0;h - w007]h:w u$ unset TMOUT
[033]0;h - w007]h:w u$ ksh -c "echo \$TMOUT"
0
bash, zsh, ash/dash do not.
> And since when are 2 forks a suitable tradeoff for portability?
It's just a guard to avoid unnecessary tests, like
test "${TMOUT+set}" = set && (...) 2>/dev/null
It's not affecting portability.
> Should we document $TMOUT as a reliable way to detect ksh, the way we already
> use {BASH,ZSH}_VERSION as reliable witnesses of those two shells?
Maybe; in any case, if we aren't saying it already we should point out
that they can be exported and this affects the tests.
Paolo
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