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3.4. 设置root密码

Setting a good root password is the most basic requirement for having a secure system. See passwd(1) for some hints on how to create good passwords. You can also use an automatic password generation program to do this for you (see 第 4.11.20 节 “生成用户密码”).
Plenty of information on choosing good passwords can be found on the Internet; two that provide a decent summary and rationale are Eric Wolfram's http://wolfram.org/writing/howto/password.html and Walter Belgers' https://web.archive.org/web/20030218000949/http://www.belgers.com/write/pwseceng.txt