如果我们想在Bash中判断一个命令的输出结果是否为空,我们可以使用test命令和-z参数。示例代码如下:

if test -z "$(ls | grep test1.txt)"; then
    echo "The result is empty."
else
    echo "The result is not empty."
fi
 
if test ! -z "$(ls | grep test2.txt)"; then
    echo "The result is not empty."
else
    echo "The result is empty."
fi

 

posted on 2021-03-09 17:26  陌鉎こ城sHi  阅读(1509)  评论(0编辑  收藏  举报