杀死进程树

function getchld_kill()
{
        if [[ -z "$1" ]];
        then
                echo "arguemnt 1 should be a number";
                exit;
        fi
        local child
        local father=$1
#        echo  "father: ${father}"
        local childs=$(ps -ef | awk -v father=$father 'BEGIN{ ORS=" "; } $3==father{ print $2; }')
#        echo "childs: " ${childs[*]}
        if [[ ${#childs[@]} -ne 0 && -n "${childs[0]}" ]];
        then
                for child in ${childs[@]}
                do
#                       echo child:${child}
                        getchld_kill ${child}
                done
                echo "killing the father: ${father}"
                kill -9 ${father}
        else
                echo "killing myself pid:${father}"
                kill -9 ${father}
                return
        fi
}

getchld_kill $1

使用递归调用实现了树的深度优先遍历:
递归条件是 childs 数组不空, 且第一个元素非空( awk 在叶子上返回一个第一个元素是空的数组)
base line condition 设置在叶子进程上进行递归返回.
getchld_kill 的参数是树根进程.