如何特别使用find命令和wc命令查找目录和所有子目录中所有.txt文件的数量? [英] How do I find the number of all .txt files in a directory and all sub directories using specifically the find command and the wc command?

问题描述

到目前为止，我有这个:

So far I have this:

find -name ".txt"

我不太确定如何使用wc来查找确切的文件数.使用上面的命令时，所有.txt文件都会显示，但我需要扩展名为.txt的文件的确切 number .请不要建议使用其他命令，因为我想专门使用 find 和 wc .谢谢

I'm not quite sure how to use wc to find out the exact number of files. When using the command above, all the .txt files show up, but I need the exact number of files with the .txt extension. Please don't suggest using other commands as I'd like to specifically use find and wc. Thanks

推荐答案

尝试:

find . -name '*.txt' | wc -l

wc的-l选项告诉它仅返回行数.

The -l option to wc tells it to return just the number of lines.

如果任何.txt文件名包含换行符，则上面的代码将输入错误.它将与任何文件名一起正常工作:

The above will give the wrong number if any .txt file name contains a newline character. This will work correctly with any file names:

find . -iname '*.txt' -printf '1\n' | wc -l

-printf '1\n告诉find为找到的每个文件名仅打印行1.这样可以避免文件名中包含难以识别的字符的问题.

-printf '1\n tells find to print just the line 1 for each file name found. This avoids problems with file names having difficult characters.

让我们创建两个.txt文件，一个文件的名称中包含换行符:

Let's create two .txt files, one with a newline in its name:

$ touch dir1/dir2/a.txt $'dir1/dir2/b\nc.txt'

现在，让我们找到find命令:

Now, let's find the find command:

$ find . -name '*.txt'
./dir1/dir2/b?c.txt
./dir1/dir2/a.txt

要计数文件:

$ find . -name '*.txt' | wc -l
3

如您所见，答案只有一个.但是，改进的版本可以正常工作:

As you can see, the answer is off by one. The improved version, however, works correctly:

$ find . -iname '*.txt' -printf '1\n' | wc -l
2

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