linux - Using Wildcards and grep

Question

How would I find out how many students have an o in their account name in my server. Their home directory is in /home/students

I have tried

grep *o* /home/students

this does not work.

Answer 1

你可以说：

find /home/students -mindepth 1 -maxdepth 1 -type d -name "*o*"

这将返回包含o.

为了找到计数，管道到wc -l：

find /home/students -mindepth 1 -maxdepth 1 -type d -name "*o*" | wc -l

这篇文章解释了为什么你不应该解析ls.

Answer 2

这不会列出目录内容：

ls -1d *o* | wc -l

Answer 3

使用具有适当文件模式的数组：

o_students=( /home/students/*o*/ )
echo "${#o_students[@]}"

Answer 4

利用

ls -1 /home/students | grep o | wc -l

- 你不能这样做，ls -1 /home/students/*o* 因为它会列出匹配目录中的文件。