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sudo: unable to resolve host abc


         在127.0.0.1 localhost 后面加上主机名称(hostname) 即可, /etc/hosts 内容修改成如下:
127.0.0.1       localhost abc  #要保证这个名字与 /etc/hostname中的主机名一致才有效
# 或改成下面这两行
#127.0.0.1       localhost
#127.0.0.1       abc
这样设完后, 使用sudo 就不会再有那个提示信息了。
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