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Get IP from hostname
Get the IP of a hostname.

Find all SUID binaries

Check tcp-wrapping support
This function returns TRUE if the application supports tcp-wrapping or FALSE if not by reading the shared libraries used by this application.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Using mplayer to play the audio only but suppress the video
Sometimes you only want to linsten the audio while output the video will be a waste of CPU resource and an annoying window. With option -vo null, you will enjoy the audio!

syncronizing datas beetween two folder (A and B) excluding some directories in A (dir1 and dir2)

Shows what an RPM was compiled with.
\n Separates out the architectures on different lines.

List your MACs address
No need for the ls -r and a sort is also not really needed.

Toggle between directories
switch to previous directory or toggle

Prevent non-root users from logging in
Also with optional message: $ echo "no login for you" > /etc/nologin (This doesn't affect your current X session - you're already logged in!)


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