In /usr/bin/pa-info line 27:
		[[ $line =~ $re ]] && cards+="${BASH_REMATCH[1]} "
                                      ^---^ SC2179: Use array+=("item") to append items to an array.


In /usr/bin/pa-info line 29:
	echo $cards
             ^----^ SC2128: Expanding an array without an index only gives the first element.
             ^----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
	echo "$cards"


In /usr/bin/pa-info line 32:
	local cards=($(cards_get))
                     ^----------^ SC2207: Prefer mapfile or read -a to split command output (or quote to avoid splitting).


In /usr/bin/pa-info line 36:
			[[ $line != "" ]] && amixer -c$card cget "$line";
                                                      ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
			[[ $line != "" ]] && amixer -c"$card" cget "$line";


In /usr/bin/pa-info line 37:
		done <<< "$(amixer -c$card controls | grep Jack)"
                                     ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
		done <<< "$(amixer -c"$card" controls | grep Jack)"


In /usr/bin/pa-info line 42:
	[ $alsa_info ] || alsa_info=$(which alsa-info)
          ^--------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
	[ "$alsa_info" ] || alsa_info=$(which alsa-info)


In /usr/bin/pa-info line 43:
	[ $alsa_info ] || alsa_info='/usr/share/alsa-base/alsa-info.sh'
          ^--------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
	[ "$alsa_info" ] || alsa_info='/usr/share/alsa-base/alsa-info.sh'


In /usr/bin/pa-info line 51:
	ps aux | grep pulseaudio
        ^-- SC2009: Consider using pgrep instead of grepping ps output.

For more information:
  https://www.shellcheck.net/wiki/SC2128 -- Expanding an array without an ind...
  https://www.shellcheck.net/wiki/SC2179 -- Use array+=("item") to append ite...
  https://www.shellcheck.net/wiki/SC2207 -- Prefer mapfile or read -a to spli...