Linux 终端命令查找包含特定单词的行？
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Terminal command to find lines containing a specific word?
提问by willykao
I was just wondering what command i need to put into the terminal to read a text file, eliminate all lines that do not contain a certain keyword, and then print those lines onto a new file. for example, the keyword is "system". I want to be able to print all lines that contain system onto a new separate file. Thanks
我只是想知道我需要在终端中输入什么命令来读取文本文件，删除所有不包含某个关键字的行，然后将这些行打印到一个新文件上。例如，关键字是“系统”。我希望能够将包含 system 的所有行打印到一个新的单独文件上。谢谢
采纳答案by Eric B.
grepis your friend.
grep是你的朋友。
For example, you can do:
例如，您可以执行以下操作：
grep system <filename> > systemlines.out
man grep and you can get additional useful info as well (ex: line numbers, 1+ lines prior, 1+lines after, negation - ie: all lines that do not contain grep, etc...)
man grep 并且您还可以获得其他有用的信息（例如：行号、1+ 行之前、1+ 行之后、否定 - 即：所有不包含 grep 的行等...）
If you are running Windows, you can either install cygwinor you can find a win32 binary for grep as well.
如果您运行的是 Windows，您可以安装cygwin，也可以为 grep 找到一个 win32 二进制文件。
回答by Craig Mc
grep "system" filename > new-filename
grep“系统”文件名>新文件名
You might want to make it a bit cleverer to not include lines with words like "dysystemic", but it's a good place to start.
您可能想让它更聪明一点，不包含带有“dysystemic”之类的词的行，但这是一个很好的起点。
回答by Balaswamy Vaddeman
below grepcommand will solve ur problem
下面的grep命令将解决你的问题
grep -i yourword filename1 > filename2
with -i for case insensitiveness
with -i for case insensitiveness
without -i for case sensitiveness
without -i for case sensitiveness
to learn how grep works on ur server ,refer to man page on ur server by the following command
要了解 grep 如何在您的服务器上工作，请通过以下命令参考您的服务器上的手册页
man grep
回答by Jonathon Reinhart
grep '\<system\>'
Will search for lines that contain the wordsystem, and not system as a substring.
将搜索包含单词system 而不是 system 作为子字符串的行。
