SHELL2. 打印文件的最后5行
描述
经常查看日志的时候，会从文件的末尾往前查看，于是请你写一个 bash脚本以输出一个文本文件 nowcoder.txt中的最后5行#include<iostream>
using namespace std;
int main()
{
int a = 10;
int b = 100;
cout << "a + b:" << a + b << endl;
return 0;
} int a = 10; int b = 100; cout << "a + b:" << a + b << endl; return 0; }
Bash 解法, 执行用时: 2ms, 内存消耗: 356KB, 提交时间: 2021-05-11
#！/bin/bash
while read line
do
row=$((row+1))
done<nowcoder.txt
while read line
do
if [ $row -lt 6 -a $row -gt 0 ]
then
echo $line
fi
row=$((row-1))
done<nowcoder.txt
Bash 解法, 执行用时: 2ms, 内存消耗: 376KB, 提交时间: 2021-05-23
#! /bin/bash
while read line
do
row=$((row+1))
done<nowcoder.txt
while read line
do
if [ $row -lt 6 -a $row -gt 0 ]
then
echo $line
fi
row=$((row-1))
done<nowcoder.txt
Bash 解法, 执行用时: 2ms, 内存消耗: 376KB, 提交时间: 2021-05-11
row=0
while read line
do
row=$((row+1))
done < nowcoder.txt
while read line
do
if [ $row -lt 6 -a $row -gt 0 ]
then
echo $line
fi
row=$((row-1))
done<nowcoder.txt
Bash 解法, 执行用时: 2ms, 内存消耗: 376KB, 提交时间: 2021-05-08
row=0
while read line
do
((row++))
done < ./nowcoder.txt
while read line
do
if [ $row -le 5 -a $row -ge 1 ]
then
echo $line
fi
row=$(($row-1))
done < ./nowcoder.txt
Bash 解法, 执行用时: 2ms, 内存消耗: 376KB, 提交时间: 2021-04-26
#!/bin/bash
row=0
while read line
do
row=$((row+1))
done<nowcoder.txt
while read line
do
if [ $row -lt 6 -a $row -gt 0 ]
then
echo $line
fi
row=$((row-1))
done<nowcoder.txt