ls 命令，list 的缩写，显示当前目录下的内容。

基本格式

ls [选项] 目录名称

实例

ubuntu@VM-0-14-ubuntu:~$ ls
1.sql  2.sql  hello.txt  test.php

ubuntu@VM-0-14-ubuntu:~$ ls -lh /var
total 40K
drwxr-xr-x  2 root root   4.0K Jul 19 06:25 backups
drwxr-xr-x 15 root root   4.0K Apr 27 17:44 cache
drwxrwxrwt  2 root root   4.0K Jul 14 06:25 crash
drwxr-xr-x 54 root root   4.0K Jul 13 09:40 lib
drwxrwsr-x  2 root staff  4.0K Apr 15  2020 local
lrwxrwxrwx  1 root root      9 Apr 23  2020 lock -> /run/lock
drwxrwxr-x 11 root syslog 4.0K Jul 20 00:00 log
drwxrwsr-x  2 root mail   4.0K Apr 23  2020 mail
drwxr-xr-x  2 root root   4.0K Apr 23  2020 opt
lrwxrwxrwx  1 root root      4 Apr 23  2020 run -> /run
drwxr-xr-x  4 root root   4.0K Apr 23  2020 spool
drwxrwxrwt  5 root root   4.0K Jul 20 00:00 tmp