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For those unfamiliar with ${var+foo}, it evaluates to foo if var is set, even if empty, and nothing otherwise.

muru
– muru

2016-01-02 00:31:49 +00:00
Commented Jan 2, 2016 at 0:31
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?

muru
– muru

2016-01-02 03:44:01 +00:00
Commented Jan 2, 2016 at 3:44
@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.

Gilles 'SO- stop being evil'
– Gilles 'SO- stop being evil'

2016-01-02 07:36:53 +00:00
Commented Jan 2, 2016 at 7:36

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