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Unix Login activity

I am new to unix and was wondering if unix keeps a log of activity like account creation and password changes etc.

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JonMnyAuthor Commented:
Also would be interested if there is a way to see what commands they ran
The first thing to learn about Unix is there is no operating system actually called Unix.  Each of the Unix flavours/variants have their own admin tools which can diff greatly from platform to platform.

So the first thing to tell us is which Unix flavour you are talking about.

In general, most Unix systems don't keep a log of when accounts were created or password changes or what commands have been run.

However, these can be logged depending on the Unix flavour and what tools you can use configure.
JonMnyAuthor Commented:
Sorry, there is no such infor available  in the system, unless you maunally write a log file for the job.
You can try to look at the sam log
man samlog_viewer
to learn more details.
PS: if someone use "useradd" to create an new account, and "passwd" command to change password, there will be nothing record in the sam log!
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