"Pick" Sort command

Options

-B: Ignores whitespace characters that begin before each line;

-C: Check whether the file has been sorted in order;

-D: When sorting, ignore other characters while processing English letters, numbers and space characters;

-F: When sorting, lowercase letters are treated as uppercase letters;

-I: When sorting, omit other characters except ASCII characters between 040 and 176;

-M: Merge the files of several sort numbers;

-M: Sorts the first 3 letters according to the abbreviation of the month;

-N: According to the size of the numerical order;

-o< output file;: Deposit the sorted result into the prepared document;

-r: Sort in reverse order;

-t< delimited character;: Specifies the field separator character to use when sorting;

-U: Removes duplicate rows in the output line;

+< start >-< end fields: Sort by the specified fields, ranging from the Start field to the previous column in the End field.

From Http://man.linuxde.net/sort

1 How the Sort works

Sort compares each line of a file as a unit, comparing it from the first character backwards, to the ASCII value in turn, and finally outputting them in ascending order.

Cat seq  sortseq. Txtapplebananaorangepear

The-t option and the-K option for 2.sort

Cat Facebook.txtbanana: :5.5Apple:2.5pear:2.3  Orange:3.4

This file has three columns, separated by a colon between the column and column, the first column indicates the fruit type, the second column represents the fruit quantity, and the third column represents the fruit price. So I would like to sort by the number of fruits, that is, in the second column, how to use the sort implementation? Fortunately, sort provides the-t option, after which you can set the spacer. (does not think of cut and paste's-D option, resonance ~ ~) after specifying the spacer, you can use-K to specify the number of columns.

Sort 2 -t:facebook.txtapple::2.5Orange:3.4  Banana:5.5pear:2.3

We use the colon as the spacer, and we sort the numbers in ascending order for the second column, and the result is very satisfying.

3. The-N option for sort

Have you ever encountered 10:2 small cases. I've met anyway. This occurs because the sorting program sorts the numbers by character, and the sorting program compares 1 and 2, which is obviously 1 small, so 10 is placed before 2. This is also the sort's consistent style. If we want to change this situation, we need to use the-n option to tell sort, "Sort by value"!

"Pick" Sort command