BASH: Does it support conditional variables like var="test"?"1":"2"

Question

I am new to bash but have done lots of PHP, and Javascript.

Is there some sort of equivilent to this PHP?

$default = 10;
$var = (!$var) ? $default : $var;

Thanks

Answer 1

Yes, it does:

var=${var:-10}

Even with other variables:

unset var
export def=99
echo ${var:-${def}} # gives '99'
export var=7
echo ${var:-${def}} # gives '7'