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Extract audio from Flash video (*.flv) as mp3 file

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

Getting started with tcpdump
At some point you want to know what packets are flowing on your network. Use tcpdump for this. The man page is obtuse, to say the least, so here are some simple commands to get you started. -n means show IP numbers and don't try to translate them to names. -l means write a line as soon as it is ready. -i eth0 means trace the packets flowing through the first ethernet interface. src or dst w.x.y.z traces only packets going to or from IP address w.x.y.z. port 80 traces only packets for HTTP. proto udp traces only packets for UDP protocol. Once you are happy with each option combine them with 'and' 'or' 'not' to get the effects you want.

list all opened ports on host

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)

Get absolut path to your bash-script

Download Video & extract only a specific Time of it
Because this does not download more of the video than necessary, it is faster (especially with long videos).

create shortcut keys in bash

Remove all HTML tags from a file
A shorter version of command #3014, using awk instead of sed. Useful when scraping websites with a script.

list block devices
Shows all block devices in a tree with descruptions of what they are.


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