Operation and Maintenance
Linux Operation and Maintenance
Detailed explanation of the use of sort command in Linux
Detailed explanation of the use of sort command in Linux
sort is a very commonly used command in Linux. It treats each line of the file as a unit and compares it with each other. The comparison principle is from the first character backward and press ASCII in sequence. The code values are compared, and finally they are output in ascending order.
There is a file test here, the content is:
8723 23423 321324 213432 23 234 123 231 234 1234 654 345234
1. The -t option and -k option of sort
sort provides the -t option, which can be set later separator, -k to specify the number of columns.
Sort the first column
sort test
Sort the second column
sort -k 2 test
If you change the content of the test file to:
8723,23423 321324,213432 23,234 123,231 234,1234 654,345234
If you want to The second column is sorted by size
sort -t "," -k 2 test
If there is no -t option, it is the default space or tab key, so the -t option is not used above.
2. Use the -r option to sort in reverse order
The default sorting method of sort is ascending order, and the -r parameter is changed to descending order
sort -r test
Output result:
8723 23423 654 345234 321324 213432 234 1234 23 234 123 231
3. The -n option of sort
sort compares by ASCII code value by default, so if you look at the results in 2 above, you will find that 8723 is ranked first compared to 321324. So how do we make it sort by numerical size? This is when the -n parameter comes into play.
sort -n test
Output result:
23 234 123 231 234 1234 654 345234 8723 23423 321324 213432
sort -rn test
Output result:
321324 213432 8723 23423 654 345234 234 1234 123 231 23 234
Attachment: Detailed explanation of sort command parameters
-f Convert all lowercase letters to uppercase letters. Compare, that is, ignore case
-c Check whether the file has been sorted. If it is out of order, output the relevant information of the first out-of-order line, and finally return 1
-C Check whether the files are sorted. If they are out of order, the content will not be output and only 1 will be returned.
-M Sort by month, such as JAN is less than FEB, etc.
-b Ignore each All blank parts in front of a line are compared starting from the first visible character
-u Remove duplicate lines from the output line without changing the content of the file itself
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