平台：
Red Hat Enterprise Linux 5
2.6.18-194.el5
故障描述，使用oracle用户登录linux时报错：
User's $HOME/.dmrc file is being ignored. This prevents the defaults
session and language from being saved. File should be owned by user and
have 644 permissions. User's $HOME directory must be owned by user and
not writable by other users.
故障原因，用户错误地执行了下面的命令：
chmod -R 775 /home/oracle
解决办法，依次执行下面的命令：
sudo chown oracle /home/oracle/.dmrc
chmod 644 /home/oracle/.dmrc
sudo chown oracle /home/oracle
chmod 755 /home/oracle
参考，ubuntu系统下，对此问题的详细解释：
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