One question to understand multiple parameters of sort command in Linux

The sort command is very commonly used, but it also has many parameters, such as: -o, -n, -u, -r, and you may not be able to remember how to use it at the moment. Here is a question that can be well combined with the above parameters to achieve a good memory effect.

Title: The data file data contains the following data:

4
1
3
5
1001
2
4
5

Please use one command to reverse the sort, remove duplicates and save the data in the data file as well. Final output:

1001
5
4
3
2
1

To achieve the above three requirements, we need to use the above parameters at the same time. The specific commands are as follows:

[root@localhost ~]# cat data | sort -nur -o data
1001
5
4
3
2
1

Remark:

• -u parameter # Remove duplicates
• -n parameter # Sort by natural numbers instead of ASCII
• -r parameter # sort in descending order
• -o parameter # write the file to the file instead of standard output

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