sudo su - username 跟 sudo su username 有什么不同的地方，之前使用后一种进入用户后会存在部分环境变量未加载的情况，原因是什么？
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BeavanJun 29, 2017
1
没有- 虽然切换了用户，但一些环境变量还是用的切换用户的环境变量，不属于完整切换。
加上- 完整切换，对应的环境变量也切换为对应用户身边。 |
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bestoJun 29, 2017
2
man su:
-, -l, --login Provide an environment similar to what the user would expect had the user logged in directly. When - is used, it must be specified before any username. For portability it is recommended to use it as last option, before any username. The other forms (-l and --login) do not have this restriction. |
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zent00Jun 29, 2017
4
一句话简单概括，login shell 和 non-login shell 的差异，前者会切换用户身份并加载目标用户的环境变量，后者只是切换身份到目标用户。
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GGGG430Jun 29, 2017
5
google: suid,sgid
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