until语法
#!/bin/bash

var=100
until [ $var -eq 0 ]
do
    echo var is $var
    var=$[ $var -25 ]
done

until同时执行两条语句
#!/bin/bash

var=100
until echo $var
        [ $var -eq 0 ]
do
    echo var is $var
    var-$[ $var - 25 ]
done