Linux – Temporary changes to /etc/passwd or /etc/group – how-to

groupslinuxpasswduser-management

I want to temporarily modify /etc/passwd and/or /etc/group to "remove" a user/group without deleting the line.

Is there a way to do that?

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1161913 seems to indicate it may not be supported (but may also be HPUX-specific).

Best Answer

to temporarily lock a user's account you can do passwd -l username which simply adds a '!' to the beginning of the password hash in /etc/shadow, preserving the user's password, and preventing them from being able to log in with any password.

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Linux – Send email when anyone logs on

You should use a solucion for log monitoring like OSSEC, it will look on your logs for security information (including login, sudo, etc.) and send you an e-mail when the alert is important.

It's easy to configure and you can raise the alert level for e-mails or include an alert-by-email on the specific alert.

It can also do configurable active-response, blocking IPs and denying access for a period of time by default.

Linux Bash – How to Sort du -h Output by Size

As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:

du -hs * | sort -h

If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:

brew install coreutils
du -hs * | gsort -h

From sort manual:

-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)

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Linux Bash – How to Sort du -h Output by Size

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