字符串连接

(1)

root@tcx4440-03:~# value1=/etc/
root@tcx4440-03:~# value2=yum.repos.d/
root@tcx4440-03:~# value3=${value1}${value2}
root@tcx4440-03:~# echo $value3
/etc/yum.repos.d/

(2)

root@tcx4440-03:~# echo $value1$value2
/etc/yum.repos.d/

(3)

root@tcx4440-03:~# value3=${value1}.gz
root@tcx4440-03:~# echo $value3
/etc/.gz