shell字符串连接

shell字符串连接直接放到一起或用双引号即可。

例如$a, $b，有

c=$a$b

c=$a"xyz"$b

c=$a$b.txt

#!/bin/bash
a="Hello "
b=" World!"
c1=$a$b
c2=$a"and"$b
c3=$a$b.txt
echo $c1
echo $c2
echo $c3

输出是

Hello World!
Hello and World!
Hello World!.txt