依次按行数显示

fh21_xuejinlian

#!/bin/bash
#
file=/var/log/messages
num=`wc -l $file |awk '{print $1}'`
lines=$(($num/100))
read -p "Input a number: " linenum
if [ $linenum -le $lines ];then
  sed -n  "$((($linenum-1)*100+1)),$(($linenum*100))p" $file
else
  echo " $linenum is bigger than $lines"
  exit  1
fi