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Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

View webcam output using mplayer
View webcam output using mplayer, with correct fps and outfmt settings according to my webcam model.

Play all files in the directory using MPlayer
Skip forward and back using the < and > keys. Display the file title with I.

List of services sorted by boot order in Redhat-based systems

Find all active ip's in a subnet
nmap for windows and other platforms is available on developer's site: http://nmap.org/download.html nmap is robust tool with many options and has various output modes - is the best (imho) tool out there.. from nmap 5.21 man page: -oN/-oX/-oS/-oG : Output scan in normal, XML, s|

One command line web server on port 80 using nc (netcat)
Very simple web server listening on port 80 will serve index.html file or whatever file you like pointing your browser at http://your-IP-address/index.html for example. If your web server is down for maintenance and you'd like to inform your visitors about it, quickly and easily, you just have to put into the index.html file the right HTML code and you are done! Of course you need to be root to run the command using port 80.

Show a line when a "column" matchs

grep processes list avoiding the grep itself
Trick to avoid the form: grep process | grep - v grep

Reverse ssh
Both hosts must be running ssh and also the outside host must have a port forwarded to port 22.


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