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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"

Make a file not writable / immutable by root
http://linuxhelp.blogspot.com/2005/11/make-your-files-immutable-which-even.html

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"

Set a user password without passwd
Slightly shorter. It doesn't create a subprocess either.

find files ignoring .svn and its decendents

Find the package that installed a command

attach to bash shell in the last container you started

list files recursively by size

Check the package is installed or not. There will show the package name which is installed.
The ^python$ is a package name patten. You can change whatever you want.

Tail a log-file over the network
it also works with the chrome browser. The alternative with tail and nc doesn't


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