Append text after a file in linux

In linux, append the text after the file-Linux Enterprise Application-Linux server application information. The following is a detailed description. Add the text "testing" to the top file

Echo "testing"> filename;

Server Configuration/etc/rsyncd. conf file

[Root @ etc] # cat rsyncd. conf
Log file =/var/log/rsyncd. log
Uid = nobody
Gid = nobody
Hosts allow = 1.1.0.0/16
Max connections = 10
Use chroot = true

[Aa]
Comment = this is testing
Path =/root/test
Read only = true
List = true

Copy files from the client
/Usr/bin/rsync-auqz server ip Address: aa/.../root /...........