Linux 如何对目录中的所有文件执行grep操作
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how perform grep operation on all files in a directory
提问by user2147075
Working with xenserver, and I want to perform a command on each file that is in a directory, grepping some stuff out of the output of the command and appending it in a file.
使用 xenserver，我想对目录中的每个文件执行一个命令，从命令的输出中提取一些内容并将其附加到文件中。
I'm clear on the command I want to use and how to grep out string(s) as needed.
我很清楚我想使用的命令以及如何根据需要 grep 出字符串。
But what I'm not clear on is how do I have it perform this command on each file, going to the next, until no more files are found.
但是我不清楚的是如何让它对每个文件执行此命令，转到下一个，直到找不到更多文件。
回答by Narain
In Linux, I normally use this command to recursively grep for a particular text within a dir
在 Linux 中，我通常使用此命令递归 grep 查找目录中的特定文本
grep -rni "string" *
where,
在哪里，
r = recursive i.e, search subdirectories within the current directory
n = to print the line numbers to stdout
i = case insensitive search
r = 递归，即搜索当前目录中的子目录
n = 将行号打印到标准输出
i = 不区分大小写的搜索
回答by umi
grep $PATTERN *would be sufficient. By default, grep would skip all subdirectories. However, if you want to grep through them, grep -r $PATTERN *is the case.
grep $PATTERN *就足够了。默认情况下，grep 会跳过所有子目录。但是，如果您想遍历它们，grep -r $PATTERN *情况就是如此。
回答by Rob
Use find. Seriously, it is the best way because then you can really see what files it's operating on:
使用查找。说真的，这是最好的方法，因为这样你就可以真正看到它在操作哪些文件：
find . -name "*.sql" -exec grep -H "slow" {} \;
Note, the -H is mac-specific, it shows the filename in the results.
请注意，-H 是特定于 mac 的，它在结果中显示文件名。
回答by bryan
If you want to do multiple commands, you could use:
如果要执行多个命令，可以使用：
for I in `ls *.sql`
do
grep "foo" $I >> foo.log
grep "bar" $I >> bar.log
done
回答by Noam Manos
To search in all sub-directories, but only in specific file types, use grep with --include.
要在所有子目录中搜索，但仅在特定文件类型中搜索，请将 grep 与--include.
For example, searching recursively in current directory, for text in *.yml and *.yaml :
例如，在当前目录中递归搜索 *.yml 和 *.yaml 中的文本：
grep "text to search" -r . --include=*.{yml,yaml}
