Installing and removing node.js

How to install node.js on Mac OSX?
R> go to the http://nodejs.org/ site and click install

How to uninstall node.js on Mac OSX?
R> sudo rm -rf /usr/local/{bin/{node,npm},lib/node_modules/npm,lib/node,share/man/*/node.*}

rsync magic

How to transfer filtered files and its entire directory structure to other unix machine, fast, compressed and efficiently? well... rsync

rsync -azvr --include-files='*.log' --include-files='*/' -exclude-files='*' --prune-empty-dirs <source dir> <target dir>

GeekTool CPU+Mem+Disk

Today I add a new geeklet to my desktop (http://projects.tynsoe.org/en/geektool/), it shows cpu+mem+disk and i needed it, because I'm tired to open Monitor application on my Mac.

I download the base version from:
http://www.macosxtips.co.uk/geeklets/modules/upload/attachments/CPUMemDskUsage.glet
And then make some adjustments to make it work with Lion and to improve performance. At the end the script look like this:

Convert PST to MBOX

Importing from outlook to apple mail not difficult at all, at your mac os terminal:

1) install libpst (macports required)

sudo port install libpst

2) convert the pst

readpst -o <output directory> <my pst file>.pst

3) Import

At apple mail: File > Import mailboxes > Files in mbox format

thats all

telnet: sending a mail with smtp

How to test SMTP using telnet, just like this:

$telnet <smtpserver> 25
ehlo
mail from: <source mail>
rcpt to: <target mail>
data
<all content you want>
.
quit

How to execute ssh command and stay logged in

After using implicit authentication a new challenge came, how to exec a command and stay logged in. just like this:

ssh -t <user>@<host> "ls -l; bash -login"

look for a class on a bunch of jars...

Challenge: how to find a class inside a lot of jars which are inside an unknown directory hierarchy.
Answer: bash scripting

find . -name "*.jar" -exec jar tvf '{}' \; -print | grep -e "<classname>.class" -e "\./"