shell编程实战13

#!/bin/bash

read -p "please input a number" n
n1=`echo $n|sed ‘s/[0-9]//g‘`
if [ -n "$n1" ]
then
echo "请输入一个纯数字"
exit
fi

for i in `seq 1 $n`
do
echo $i
done

read -p "If continue? y/n" -c
case $c in
n|N)
exit
;;
y|Y)
read -p "please input a number" n2
n3=`echo $n2|sed ‘s/[0-9]//g‘` ##考虑用函数
if [ -n "$n3" ]
then
echo "请输入一个纯数字"
exit
fi
if [ $n2 -le $n ]
then
echo "$n2 should be greater than $n"
exit
fi
for i in `seq $[$n+1] $n2`
do
echo $i
done
;;
*)
echo "please input y or n"
;;
esac