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Linux Tutorial Topics: 

Note that any given object can relate to more than one topic, so it is likely that pages will appear more than once. For example, concepts may relate to topics that are slightly different from the topic of the page where they are discussed in detail.



Basic Administration -> User Accounts -> User Accounts
System Monitoring -> What the System Is Doing Now -> Users
Security -> Security
Security -> Real Threats
Security -> Restricting Access
Security -> Passwords
Security -> File Access
Security -> The Root Account
Security -> The Network


You can switch the user you run a program as using the 'su' command.
The terms "user" and "user account" are often interchanged in different contexts.
Typically a "user" is a real person and the "user account" is the evironment when the user logs in.
The name of the file's owner is not stored in the file's inode.
When using the wall command, the root user can still send to users who have messaging disabled.
Even small pieces of information about your system can be useful to a hacker.
When an user account is inactive for extended periods, it should be disabled or removed.
No one should have write permission to a users home directory other than the user.
Incorrect entries in a user's .rhosts file could be a security hole
One security common mistake is that the .rhosts file is world-readable
The 'who' command will show you who is currently logged in.


account     administrator     application     boot     CD-ROM     directory name     DOS     encrypt     encrypted password     environment     error message     event     file permissions     filesystem     ftp     GID     home directory     host     HOWTO     HTTP     inode     ISDN     login     logname     mount     multi-user     network     NFS     operating system     permissions     pipe     security     shell     SUID     terminal     text     UID     UNIX     user name     wildcard     WWW    

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