Question

shell 字符串无法拼接

#!/bin/sh
s1="hello"
s2="world"
echo ${s1}${s2}

结果
[root@CHBJUPRDBP01 oracle]# sh 123.sh
world

拼接不上？？

Answer 1

root@localhost:~# s1="hello"
root@localhost:~# s2="world"
root@localhost:~# echo ${s1}${s2}
helloworld
root@localhost:~# cat 1
s1="hello"
s2="world"
echo ${s1}${s2}
root@localhost:~# sh 1
helloworld
没有问题啊。你是不是bash
root@localhost:~# ll /bin/sh
lrwxrwxrwx 1 root root 4 4月 6 2016 /bin/sh -> bash

Answer 2

用引号把echo后的两变量引起来

Answer 3

你使用字符串连接符 "+" 试一试看看。即：echo ${$1}+${$2}