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Jan 2, 2016 at 7:36 comment added Gilles 'SO- stop being evil' @muru If you're writing a bash script, you can use export -n or typeset +x indifferently. In ksh or zsh, there's only typeset +x.
Jan 2, 2016 at 3:44 comment added muru Say, do you have any comments on typeset +x vs export -n for the shells that do support the former? Is export -n rarer, or does it not preserve some properties?
Jan 2, 2016 at 0:32 vote accept muru
Jan 2, 2016 at 0:31 comment added muru For those unfamiliar with ${var+foo}, it evaluates to foo if var is set, even if empty, and nothing otherwise.
Jan 2, 2016 at 0:27 history edited muru CC BY-SA 3.0
$2->$1: probably typo; syntax highlighting
Jan 2, 2016 at 0:16 history answered Gilles 'SO- stop being evil' CC BY-SA 3.0