1.touch命令的使用
2.使用(cd -)可以在上次使用的目录来回切换
3.ls通配符的使用*代表任意字符和任意个字符， ？代表任意一个字符， [12345]中的任意一个字符， [1-5]中的任意一个字符.
1 linxmouse@ubuntu:~/Desktop$ touch 123
2 linxmouse@ubuntu:~/Desktop$ touch 223
3 linxmouse@ubuntu:~/Desktop$ touch 323
4 linxmouse@ubuntu:~/Desktop$ touch 423
5 linxmouse@ubuntu:~/Desktop$ touch 523
6 linxmouse@ubuntu:~/Desktop$ ls *3
7 123 223 323 423 523
8 linxmouse@ubuntu:~/Desktop$ ls ?3
9 ls: cannot access '?3': No such file or directory
10 linxmouse@ubuntu:~/Desktop$ ls ?23
11 123 223 323 423 523
12 linxmouse@ubuntu:~/Desktop$ ls 2?3
13 223
14 linxmouse@ubuntu:~/Desktop$ ls [125]23
15 123 223 523
16 linxmouse@ubuntu:~/Desktop$ ls []23
17 ls: cannot access '[]23': No such file or directory
18 linxmouse@ubuntu:~/Desktop$ ls [1]3
19 ls: cannot access '[1]3': No such file or directory
20 linxmouse@ubuntu:~/Desktop$ ls [1-2]3
21 ls: cannot access '[1-2]3': No such file or directory
22 linxmouse@ubuntu:~/Desktop$ ls [1-2]23
23 123 223
4.ls的-h，
-h, --human-readable
with -l and/or -s, print human readable sizes (e.g., 1K 234M 2G)
1 linxmouse@ubuntu:~$ ls -lh
2 total 36K
3 drwxr-xr-x 2 linxmouse linxmouse 4.0K Oct 15 09:53 Desktop
4 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Documents
5 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Downloads
6 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Music
7 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Pictures
8 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Public
9 drwxrwxr-x 3 linxmouse linxmouse 4.0K Oct 15 06:47 temp
10 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 21 19:20 Templates
11 drwxr-xr-x 2 linxmouse linxmouse 4.0K Sep 3 06:51 Videos