Linux之温故知新1

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