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Re: T/F var expansion?
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From: |
Stephane Chazelas |
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Subject: |
Re: T/F var expansion? |
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Date: |
Mon, 29 Jul 2019 10:28:15 +0100 |
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User-agent: |
NeoMutt/20171215 |
2019-07-28 21:17:43 -0700, L A Walsh:
> Is there a T/F var expansion that does:
>
> var=${tst:+$yes}${tst:-$no}
>
> but with yes/no in 1 expansion?
[...]
You can also do:
no_yes=(no yes)
echo "${no_yes[${var+1}]}"
For the reverse:
echo "${no_yes[!0${var+1}]}"
See also:
map=(unset empty non-empty)
echo "${map[${var+1}+0${var:+1}]}"
--
Stephane