$ echo aaa > /tmp/file
$ ls -l /tmp/file
-rw-r--r-- 1 dick head 4 May 15 10:37 /tmp/file

# echo bbb >> /tmp/file
-bash: /tmp/file: Permission denied

系统是大便11 (5.10.0-6-amd64), 记得前几天在centos7上试过不是这样的.
--
修改:dajun FROM 119.114.253.*
FROM 119.114.253.*