文件操作 - motd
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文件: /etc/motd
编辑文件内容
The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.
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将文件时间修改为当前时间的前一年
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