题解 | #打印文件的最后5行#

#!/bin/bash

arr=()
# read file to arr
while read p;do
arr+=("$p")
done < nowcoder.txt;

# compare min length of filelines
length=5
index=${#arr[@]}
if test $index -lt 5;then length=$index;fi
length=[[ $index -ge 5 ]] && 5 || $index 
# read last 5 line
for ((i=$length;i>0;i--));
do
index2=$((index - i))
echo ${arr[$index2]}
done