Commands by sathesh (1)

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floating point operations in shell scripts
using bc is for sissies. dc is much better :-D Polish notation will rule the world...

lsof - cleaned up for just open listening ports, the process, and the owner of the process
another formatting/oneliner for lsof User - Process - Port

print first n characters of any file in human readble form using hexdump
Usefull to determine unknown file type

What is my ip?

Route outbound SMTP connections through a addtional IP address rather than your primary

clear screen, keep prompt at eye-level (faster than clear(1), tput cl, etc.)
this leaves the cursor at the bottom of the terminal screen, where your eyes are. ctrl-l moves it to the top, forcing you to look up.

ssh X tunneling over multiple ssh hosts (through ssh proxy)
Simply makes it possible to launch any X application residing on sshhost through sshproxy and display it on your screen where ever you are.

Download an entire static website to your local machine
Very nice command when you want to download a site locally to your machine, including images, css and javascript

Encrypted archive with openssl and tar
The lifehacker way: http://lifehacker.com/software/top/geek-to-live--encrypt-your-data-178005.php#Alternate%20Method:%20OpenSSL "That command will encrypt the unencrypted-data.tar file with the password you choose and output the result to encrypted-data.tar.des3. To unlock the encrypted file, use the following command:" $ openssl des3 -d -salt -in encrypted-data.tar.des3 -out unencrypted-data.tar

Schedule a command while one is already running.
Useful when you have only one terminal session e.g. ssh. and want to queue up another command after the currently running has finished(in case if you forget to run that command). Originally used as ; python-updater when running emerge. When I have noticed that a package failed due to that command not run.


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