A summary of sort

Recently a friend asked the sort commonly used some of the problems, although feel very simple, but still simple summed up:

1)-u: Option de-duplication

[email protected] ~]# cat seq.txt bananaappleapplepearorangeorange[[email protected] ~]# sort-u seq.txt Applebananaoran Gepear: We can see that there's only one apple showing

2)-R: Descending output

[[email protected] ~]# cat number.txt 12345[[email protected] ~]# sort-r number.txt 54321 as above: After adding the-r option, the contents of the Number.txt display are indeed Sort from high to low

3)-O option: Export

[Email protected] ~]# sort number.txt 12345[[email protected] ~]# sort number.txt >number.txt [[email protected] ~]# C at number.txt [[email protected] ~]# echo $?0 Description: Found the output number.txt file is empty [[email protected] ~]# cat number.txt [email protected  ] ~]# cat<<eof>number.txt> 1> 2> 3> 4> 5> eof[[email protected] ~]# cat Number.txt 12345[[email Protected] ~]# sort-r number.txt-o number.bak[[email protected] ~]# cat Number.bak 54321 as above: With the-o option, it is easy to save

4)-N option

Description: Confusion about sort numbers sorting

A, "sort is sometimes we think of convulsions, such as the number 11 is actually smaller than 8?" ”

B, this phenomenon is not accidental, it may be because the sort command by default is sorted by character, it would think that the character 8 in the ASCII word character is ranked after the character 1, so the 11 is ranked in front of 8

[[email protected] ~]# sort number.sort-u110111922134434458 using the-N option, sort will be sorted by value in the output [[email protected] ~]# Sort-nu Number.sort 123458101119214344

5) TK option

Description:the-t option, indicating that the specified interval character

-k option, specifying that we need to sort on that column

[[email protected] ~]# Cat fruit.txt # File Description: # The first column indicates the fruit type # The second column indicates the number of fruits # The third column represents the fruit price banana:30:5.5apple:10:2.5pear : 90:2.3orange:20:3.4[[email protected] ~]# sort-n-K 2-t: Fruit.txt # The second column indicates the number of fruits # The third column represents the fruit price # The first column indicates the fruit type # file content Description: Apple:10: 2.5orange:20:3.4banana:30:5.5pear:90:2.3[[email protected] ~]# sort-n-K 3-t: Fruit.txt # The second column indicates the number of fruits # The third column represents the fruit price # The first column indicates the fruit Type # File content Description: pear:90:2.3apple:10:2.5orange:20:3.4banana:30:5.5

6) A detailed analysis of-K

[[email protected] ~]# sort -t  '   '  -k  1 facebook.txt sort: multi-character tab  '-K ' description: Some sort may not be used directly with-t   "\ T "  let Tab be the delimiter, this time you can escape tab, for example use-t $ ' \ t '   so that you can make tab separator. [[email protected] ~]# sort -t $ ' \ t '  -k 1 facebook.txt baidu  100 5000google 110 5000sina 50 3000sohu 100  4500 The above output information may be due to the IME symbol problem caused:[[email protected] ~]# sort -t  '   '  -k 1  facebook.txt baidu 100 5000google 110 5000sina 50 3000sohu 100  4500-k 2 -k 3 (description sets the priority of sorting, first sort by 2nd column, if same, then sort by 3rd column) [[email protected] ~]#  sort -n -t  '   '  -k 2 -k 3 facebook.txt sina 50  3000sohu 100 4500baidu 100 5000google 110 5000 

Requirement: Let Facebook.txt sort according to the employee's salary descending order, for the company with the same employee salary, according to the company number ascending order:

[[email protected] ~]# cat facebook.txt Google 5000baidu 5000sina 3000sohu 4500[[email protected] ~]# sort -n-t ' k 3r-k 2 facebook.txt Baidu 5000google 5000sohu 4500sina 50 3000

Requirements: sorted by month (according to January, February, March)

[email protected] ~]# cat cal.txt januaryfebruaryjunemay[[email protected] ~]# sort-m cal.txt januaryfebruarymayjune

There are some sort of functions, because I do not have how to use, so there is no additional introduction

This article is from the "Frozen vs watermelon" blog, so be sure to keep this source http://molewan.blog.51cto.com/287340/1878320

A summary of sort