loops - Populating Bash array fails -

here simple command running in bash, array won;t populated reason.

array=() && sudo iwlist wlan0 scan | grep 'address'| while read line; array[${#array[@]}]=$line; done

i have tried populate array way:

array=() sudo iwlist wlan0 scan | grep 'address'| while read line; array+=($line); done

but gives me same result. know works because when this:

sudo iwlist wlan0 scan | grep 'address'| while read line; "echo $line"; done

it print every line piped grep while loop.

when check size of array " echo ${#array[@] " show 0 , if print array prints nothing. see errors in line?

**update. got working using loop so:

for line in $(sudo iwlist wlan0 scan | grep 'address' -a5); array+=($line); done

the while loop [...] executed in new subshell own copy of variable [...]

use following workaround:

while read line;     array+=("$line") done < <(sudo iwlist wlan0 scan | grep 'address')

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