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Re: How to test if a variable exists and is a hash?
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From: |
Marco Ippolito |
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Subject: |
Re: How to test if a variable exists and is a hash? |
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Date: |
Sat, 11 Jul 2020 16:08:40 -0300 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 11/07/2020 12:43, Peng Yu wrote:
$ declare -A x=([a]=10); [[ -v x ]]; echo $?
1
-v can not test if a hash is declared.
`declare -p x 2> /dev/null` can not tell whether it is a hash or a variable.
What is the best way to check if a variable exists and is a hash? Thanks.
By the way, maybe compgen could be enhanced to distinguish between
associative and non-associative arrays?
```
$ bash --noprofile --norc \
-c 'a=(); declare -A b=([x]=y); compgen -A arrayvar'
BASH_ALIASES
BASH_ARGC
BASH_ARGV
BASH_CMDS
BASH_LINENO
BASH_SOURCE
BASH_VERSINFO
DIRSTACK
GROUPS
PIPESTATUS
a
b
```