//============================================
#!/bin/bash
for a in `seq 1 2 10`
do
echo $a
done
a初始值为1, 然后 a=a+2的操作, 一直到 a<=10
---------------------
for((i=1;i<=10;i=i+2))
do
echo $i
done
for((i=1;i<=10;i++))
[17rumen@localhost ~]$ ./my_07.sh
1
3
5
7
9
//===============================================
统计文件数目
#!/bin/bash
i=0
for name1 in `ls /etc`
do
echo $name1
i=`expr $i + 1`
done
echo $i
//==============================================
#!/bin/bash
a=0
while [ $a -le 10 ]
do
((a=a+1))
if [ $a -eq 5 ]
then
continue
elif [ $a -eq 8 ]
then
break
fi
echo $a
done
-------------------
[17rumen@localhost ~]$ ./my_07.sh
1
2
3
4
6
7
//==========================================
下面是一个录入客户资料的shell脚本
#!/bin/bash
while true
do
echo "登记客户资料(c继续,q退出):"
read choice
case $choice in
c)
echo "请输入客户名字:"
read name1
echo "请输入客户年龄:"
read age1
echo "姓名:"${name1}" - 年龄:"${age1} >>customer.txt
;;
q)
exit
;;
esac
done
--------------------
>> 和 > 区别
>>customer.txt 追加保存到customer.txt文件中, 如果文件不存在会自动创建。
>customer.txt 就会重新写入, 覆盖原有的数据