#!/bin/bash
# 计算1到100所有数字和
sum=0
for i in `seq 1 100`
do
echo "$sum + $i"
sum=$[$sum+$i]
echo $sum
done
echo $sum
#!/bin/bash
#文件列表循环(常用)???
cd /etc/
for a in ls /etc/
do
if [ -d $a ] # 判断是否是目录,且存在
then
echo $a
ls $a
fi
done
[root@hao-01 ~]# for i in `ls ./`; do echo $i ; done