命令行中的文件名或目录名若包含"#"号，别忘了添加转义

$ mkdir c#
zsh: no matches found: c#

$ cd ./c#
zsh: no matches found: ./c#

$ mkdir c#
zsh: no matches found: c#

# ganzhixiong @ ganzhixiongdeMacBook-Pro-3 in ~/temp [16:34:21] C:1
$ mkdir c\#

# ganzhixiong @ ganzhixiongdeMacBook-Pro-3 in ~/temp [16:34:42] 
$ l
total 472
drwxr-xr-x   10 ganzhixiong  staff   320B Oct 15 16:34 .
drwxr-xr-x+ 178 ganzhixiong  staff   5.6K Oct 15 16:34 ..
-rw-r--r--@   1 ganzhixiong  staff    54K Sep 11 00:47 1.log
-rw-r--r--    1 ganzhixiong  staff   545B Sep 16 11:16 2.log
-rw-r--r--    1 ganzhixiong  staff    54K Sep 16 11:18 3.log
-rw-r--r--    1 ganzhixiong  staff    54K Sep 16 11:21 4.log
-rw-r--r--    1 ganzhixiong  staff    30B Sep 17 15:53 a.log
drwxr-xr-x    2 ganzhixiong  staff    64B Oct 15 16:34 c#
-rw-r--r--    1 ganzhixiong  staff    54K Sep 11 00:47 hs_err_pid1391.log
-rw-r--r--    1 ganzhixiong  staff    17B Sep 16 12:08 苹果.log

# ganzhixiong @ ganzhixiongdeMacBook-Pro-3 in ~/temp [16:34:45] 
$ cd c#  
zsh: no matches found: c#

# ganzhixiong @ ganzhixiongdeMacBook-Pro-3 in ~/temp [16:36:38] C:1
$ cd c\#/

# ganzhixiong @ ganzhixiongdeMacBook-Pro-3 in ~/temp/c# [16:36:42] 
$  echo "hello" # Linux 命令行或 Shell 中 # 号表示为注释，因此这样写不会报错
hello