为什么 ls 和 ls -l linux 命令之间的计数不同? [英] Why count differs between ls and ls -l linux command?

问题描述

我有一个包含许多文件的目录，需要检查其中存在的文件数.

I had a directory with number of files and need to check the count of files present in it.

我尝试了以下两个命令:

I tried the following two commands:

ls | wc -l
ls -l | wc -l

发现使用这两个命令时存在差异.(即，与第一个命令相比，第二个命令的使用文件数更多.)

and found there are differences while using both commands. (ie. number of files is greater in the usage of second command while comparing to the first command.)

我想知道这两个命令中发生的变化.

I would like to know the changes happening in the both commands.

推荐答案

From man ls:

-l      (The lowercase letter ``ell''.)  List in long format.  (See below.)  If the output is to a terminal, a total sum for all the file sizes is output on a line before the
         long listing.

所以 ls -l 添加了一个标题行，说明文件的总"大小:

So ls -l adds a header line stating the "total" size of files:

$ ls -l /
total 65
-r--r--r--   1 root  wheel  6197 May 11 21:57 COPYRIGHT
drwxr-xr-x   2 root  wheel  1024 Jun  1 16:02 bin
drwxr-xr-x   9 root  wheel  1536 Jun  1 16:02 boot
dr-xr-xr-x   8 root  wheel   512 Jul  7 20:16 dev
.......

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