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shell分类：交互式登录shell：以一个用户的身份登陆进去，输入命令的格式的shell 读取配置文件的顺序：            /etc/profile-->/etc/profile.d/*-->~/.bash_profile-->~/.bashrc-->/etc/bashrc     非交互式登录...

Find command related to mtime:find $HOME -mtime 0Search  for  files in your home directory which have been modified in the last twenty-four hours.  This command works this way because the time since each file was last modified is divided by 24 hours and any  remainder ...