linux 用grep匹配横线

兼容适配 软件兼容
1

file的内容如下：ADSFADSFSDFASDFJKJK

ADSFADSFSDFASDFJKJK

ADSFADSFSDFASDFJKJK

linux 用grep匹配第2行和第4行横短线：grep “^-$" file
linux 用grep匹配不含横短线的行：
grep -v "^-$” file