find programme, if not found attempts to install

command_installer

#!/bin/bash
function autoinst()
{
	declare -a _list=()
	for i
	do
		command -v "$i" > /dev/null || _list[${#_list[@]}]="$i"
	done
	
	test ${#_list[@]} -eq 0 && return 
	
	local _attempt=0
	for j in brew apt-get port yum
	do
		command -v "$j" > /dev/null || continue
		local _attempt=1
		sudo "$j" install -y -q ${_list[@]}
		return
	done
	test $_attempt -eq 1 &&
		echo "Unable to find or install ${_list[@]}" >&2 &&
		exit 1
}

There's a bug where if neither of brew apt-get port yum exists, it will skip with a exit code of 0

brew does not allow sudo