Leetcode:195. Tenth Line以及管道命令pipeline
2016-03-07 05:41
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195. Tenth Line
My SubmissionsQuestionTotal Accepted: 9416 TotalSubmissions: 29373 Difficulty: EasyHow would you print just the 10th line of a file?For example, assume thatfile.txthas thefollowing content:
Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 Line 10Your script should output the tenth line, which is:
Line 10# Read from the file file.txt and output the tenth line to stdout.#NR 表示记录数,在执行过程中对应于当前的行号awk 'NR==10' file.txt
<p class="p1"><span class="s1">guest-wireless-207-151-058-020:company hongruzh$ cat -n main.java</span></p><p class="p1"><span class="s1"> 1<span> </span>package com.company;</span></p><p class="p1"><span class="s1"> 2<span> </span></span></p><p class="p1"><span class="s1"> 3<span> </span>public class Main {</span></p><p class="p1"><span class="s1"> 4<span> </span></span></p><p class="p1"><span class="s1"> 5<span> <4000/span> public static void main(String[] args) {</span></p><p class="p1"><span class="s1"> 6<span> </span> int INF = Integer.MAX_VALUE;</span></p><p class="p1"><span class="s1"> 7<span> </span> int[][] rooms={{INF,-1,0,INF},</span></p><p class="p1"><span class="s1"> 8<span> </span> {INF,INF,INF,-1},</span></p><p class="p1"><span class="s1"> 9<span> </span> {INF,-1,INF,-1},</span></p><p class="p1"><span class="s1"> 10<span> </span> {0,-1,INF,INF}};</span></p><p class="p1"><span class="s1"> 11<span> </span> Solution solu = new Solution();</span></p><p class="p1"><span class="s1"> 12<span> </span> solu.wallsAndGates(rooms);</span></p><p class="p1"><span class="s1"> 13<span> </span><span> </span>// write your code here</span></p><p class="p1"><span class="s1"> 14<span> </span> }</span></p><p class="p1"><span class="s1"> 15<span> </span>}</span></p><p class="p1"><span class="s1">guest-wireless-207-151-058-020:company hongruzh$ cat -n main.java|sed -n '10p';</span></p><p class="p1"><span class="s1"> 10<span> </span> {0,-1,INF,INF}};</span></p><p class="p1">其中管道命令pipeline '|' cat -n main.java中的stdout内容是作为 stdin的内容来处理</p><p class="p1">’10p‘ p表示打印 10p就是打印第10行 如果是’1,10p‘ 就是打印1到10行</p>
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