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generate random password
for Mac OS X

Reconnect to screen without disconnecting other sessions
Have your screen session running in multiple places. (warning, things start to look weird if the terminal windows have different dimensions)

On Mac OS X, runs System Profiler Report and e-mails it to specified address.
Replace "user@domain.com" with the target e-mail address. Thanks to alediaz for "$HOSTNAME" which is very useful when running the command with Apple Remote Desktop to multiple machines simultaneously.

Pretty print SQL query with python in one line
You need to apt-get install python-sqlparse. This command simply formats a sql query and prints it out. It is very useful when you want to move a sql query from commandline to a shell script. Everything is done locally, so you don't need to worry about copying sql query to external websites.

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"

Find usb device
I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

remove files and directories with acces time older than a given date
touch a dummy file with the specified date, then use find with -anewer .

Display which user run process from given port name
Display which user run process from given port name

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Exclude .svn, .git and other VCS junk for a pristine tarball
~$ tar --version tar (GNU tar) 1.20


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