sum=0nu1=gowhile [ ! -z $nu1 ];do read -p "please input a number:" a nu1=`echo $a |sed 's/[0-9]//g'` if [ ! -z $nu1 ] then echo "error,please input again!" else for ((i=1;i<=$a;i++)) do sum=$[$sum+$i] done echo "$sum" fidone
#!/bin/bash
##输入一个数，必须大于1，求1到该数的和
i=0
read -t 10 -p "please input a number:" n
m=`echo $n|sed 's/[0-9]/ /g'`
if [ -z $m ] && [ $n -gt 1 ]
then
while (($i<$n))
do
i=$i+1
sum=$(($sum+$i))
done
echo $sum
else
echo "error,retry!"
fi
#!/bin/bash
sun=0
read -p 'pls a number:' n
#判断传参是否小于1
while [ $n -lt 1 ]
do
read -p 'pls a number:' n
done
#判断传参是否为空
[ -z $n ]&& exit 2
#判断传参为整数，非小数以及字符串
expr $n + 1 &>/dev/null
[ $? -ne 0 ]&& exit 3
#计算
for i in `seq 1 $n`
do
sun=$(($i+$sun))
done
echo $sun
#!/bin/bash
SUM=1
SUM01=0
function INPUT_NUM () {
while :;
do
read -p 'Input a num(the num > 1): ' NUM
if [[ $NUM =~ ^[1-9][0-9]*$ ]] && [[ $NUM -gt 1 ]]
then
echo -n "1"
while [ ! $SUM -gt $NUM ];
do
((SUM01=$SUM+$SUM01))
if [ $SUM -gt 1 ]
then
echo -n "+$SUM"
fi
((SUM=$SUM+1))
done
echo -n "=$SUM01"
break
fi
done
}
INPUT_NUM
#!/bin/bash
#This is a small script about somedatesum.sh.
#Program:
#2017-06-09-15:32:37 rengang firstrelease
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/root/bin:
export PATH
while :; do
read -p "Please input a number: " num
[ $num -gt 1 ] && break
done
declare -i sum=0
for i in `seq 1 $num`;do
let sum+=$i
done
echo $sum
欢迎指正交流
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