It's worth understanding at least those files in the login sequence that will affect things like whether you can login in the first place, where your initial environment comes from, and so on. At the risk of over-simplifying, here are the files you need to worry about that are invoked/consulted every time you log in (indented in an attempt to show who actually consults who):
/etc/passwd/etc/shadow
/etc/group
/etc/profile
/etc/profile.d/*.sh
~/.bash_profile
~/.bashrc
/etc/bashrc
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/etc/passwd defines, among other things, the username, numeric UID and GID of the user, the home directory and the login shell. For security reasons, the encrypted password is no longer stored in this file. |
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/etc/shadow represents a more secure place to store things like the encrypted password, password aging information and more. (This is the only file in this list of files that requires root privilege to display.) |
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/etc/group defines the working groups on the host, along with the users who are members of those groups. |
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Last updated：2020-05-21
mikebai This person is a lazy dog and has left nothing |