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Showing posts from November, 2012

Linux command line tips and tricks

This post lists a number of useful tips and tricks from my daily Linux experience. Mostly I deal with RHEL but I believe these commands are quite independent on Linux distribution (or can be adapted).
Network commands
Here are network commands represented.
Basic net utils: # Who is listening to port: netstat -lp | grep <port> # Show all connections with numeric addresses and proc IDs: netstat -anp # Listen to port (to check connectivity from another side): netcat -l -p <port> # -or- nc -l -p <port> SSH tunnel: # Tunnel to remote_ip:remote_port via proxy_ip with known login/password # The remote_ip:remote_port is being redirected to localhost:local_port ssh -L local_port:remote_ip:remote_port [email protected]_ip # Real-world example of tunnel to remote Sedna XML DB: ssh -L 5050:134.27.100.67:5050 [email protected] Download via HTTP proxy with wget: # Download resource from internet from behind a proxy: http_proxy=http://host:port ; export http_proxy ; wget --proxy=on …