Shell finishing (36) = = = Read the rules and write the series

(a) write the series as shown below

[Email protected] ding1]# bash 5.sh

2/1

3/2

5/3

8/5

13/8

21/13

34/21

55/34

89/55

144/89

233/144

The shell code is as follows:

#!/bin/bash

>aa

>bb

Echo 1 2 | Xargs-n1 >AA

For i in ' seq 20 '

Do

A= ' Cat AA | Sed-n ' $i ' P '

b= ' Cat AA |tail-1 '

echo $ (($a + $b)) >>aa

c= ' Cat AA | Sed-n ' $ (($i + 1)) ' P '

echo $c/$a >>BB

Done

Cat BB

The calculation results are as follows, using awk to calculate

[[email protected] ding1]# bash 5.sh |awk-f '/' {A+=$1/$2;print A} '

2

3.5

5.16667

6.76667

8.39167

10.0071

11.6261

13.2437

14.8619

16.4799

18.098

19.716

21.334

22.9521

24.5701

26.1881

27.8062

29.4242

31.0422

32.6603

[Email protected] ding1]#

This article is from the "It Life" blog, so be sure to keep this source http://dingxue.blog.51cto.com/12290895/1970438

Shell finishing (36) = = = Read the rules and write the series