1.Tenth Line How would you print just the 10th line of a file? For example, assume that file.txt has the following content:Line 1Line 2Line 3Line 4Line 5Line 6Line 7Line 8Line 9Line 10 Your script should output the tenth line, which is:Line 10-------…

leetcode 主要是一个针对北美的coder人群找工作的代码练习网站,我在2015年初次接触这个网站的时候,总共只有200多道题目,是一个类似acm 的a题网站.这些年变化越来越大,主要是因为找工作当然是多样化的考核过程,leetcode 也逐渐与时俱进,推出了下面几个类别的联系,今天我们随便挑几个练习一下: 175. Combine Two Tables -SQL Table: Person Column Name Type PersonId int FirstName varchar L…

leetcode 195. 第十行 # | | 第一种是先取出前10行,然后取出最后一行.(但是不足10行,也可以取出最后一行) 正解: tail -n +K :从第K行取出所有 然后取出第一行 leetcode 193. 有效电话号码 给定一个包含电话号码列表(一行一个电话号码)的文本文件 file.txt,写一个 bash 脚本输出所有有效的电话号码. 你可以假设一个有效的电话号码必须满足以下两种格式: (xxx) xxx-xxxx 或 xxx-xxx-xxxx.(x 表示一个数字) 你也可…

首先介绍题目中要用的4个Shell命令 sed awk head tail的常用方法.(打好地基,才能建成高楼!) sed:(转自:http://www.cnblogs.com/barrychiao/archive/2012/09/27/2706300.html) 1.定位行 sed命令用来处理文本,在处理前首先要找得到待处理的行,这是逻辑上必须的.所以需要首先定位,然后对定位到的各行进行各种处理,包括插入,删除,替换等.sed -n '10p' testfile // sed命令默认会打印出经…

195. Tenth Line -- 第十行 How would you print just the 10th line of a file? Solution: awk 'NR==10' file.txt 194. Transpose File -- 转置文件 Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and ea…

Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and each field is separated by the ' ' character. For example, if file.txt has the following content: name age alice 21 ryan 30 Output the…

统计words.txt中每个单词出现的次数并排序 解法1: cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -r | awk '{print $2,$1}' 解法2: cat words.txt | awk '{for(i=1;i<=NF;i++){count[$i]++}}END{for (i in count){print i,count[i]}}' | sort -k2nr…

195. Tenth Line 输出file.txt中的第十行 答案: # Read from the file file.txt and output the tenth line to stdout. #!/bin/bash cat file.txt | sed -n '10p' 193. Valid Phone Numbers 找出file.txt中符合(xxx) xxx-xxxx or xxx-xxx-xxxx格式的电话号码 答案: cat file.txt | grep '^(\([0…

Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and each field is separated by the ' ' character. For example, if file.txt has the following content: name age alice 21 ryan 30 Output the…

http://jasonjl.me/blog/2015/03/30/practical-programming-practice-services/ Codewars, Leetcode, Hackerrank. Online Judges Reviews written March 30, 2015 in algorithms, programming, review Sometimes the projects you work on just aren’t stimulating enou…