[Help-bash] How to get a subset of the keys of an associative array?

[Peng Yu]

Hi, I seems that there is not an equivalent ":" in the usage of
extracting associative array keys. Is there a better way to extract a
subset of the keys of an associative array?

~$ cat main.sh
#!/usr/bin/env bash
# vim: set noexpandtab tabstop=2:

declare -A assoc_array
assoc_array=([x]=a [y]=b)
echo "address@hidden"
echo "address@hidden:2}"
echo "address@hidden:2}"

~$ ./main.sh
x y

b

-- 
Regards,
Peng