我们知道我们可以使用 grep 命令在一个文件或多个文件的所有行中搜索特定的字符模式。grep 命令对文件中的单词执行不区分大小写的搜索。
让我们看一个简单的例子，我们将在一个目录中存在的所有文件中 grep 一个模式。
grep -i ‘lp’ Sample*输出结果
Sample: The sample was printed via the internet. Sample: I believe lp cares about what the device is. Sample1: This was printed via the internet. Sample1: I believe lp cares about what the device is. Sample2: This was printed via the internet. Sample3: I believe lp cares about what the device is.
这个特定场景的唯一问题是我们不希望文件名与输出一起打印。我们只需要找到特定模式的字符串，我们只需要打印该字符串。
在这种情况下，我们可以使用-h参数来隐藏文件名。
grep -i -hn ‘lp’ Sample*
根据 Linux Docs， -h 标志执行以下操作，
“-h, --no-filename
禁止输出文件名的前缀。当只有一个文件（或只有标准输入）要搜索时，这是默认设置。”
输出结果
The sample was printed via the internet. I Believe lp cares about what the device is. This was printed via the internet. I believe lp cares about what the device is. This was printed via the internet. I believe lp doesn't care what the device is