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Find all files with root SUID or SGID executables
Discovering all executables on your system that can be run as another user, especially root, is critical for system security. The above command will find those files with have SUID or SGID bits set and are owned by the root user or group.

geoip lookup

Get a list of the top 10 heaviest tables in your mysql database - useful for performance diagnostics

Install pip with Proxy
Installs pip packages defining a proxy

backup with mysqldump a really big mysql database to a remote machine over ssh
backup big mysql db to remote machine over ssh. "--skip-opt" option is needed when you can?t allocate full database in ram.

tee to a file descriptor
the tee command does fine with file names, but not so much with file descriptors, such as &2 (stderr). This uses process redirection to tee to the specified descriptor. In the sample output, it's being used to tee to stderr, which is connected with the terminal, and to wc -l, which is also outputting to the terminal. The result is the output of bash --version followed by the linecount

Mount a temporary ram partition
Makes a partition in ram which is useful if you need a temporary working space as read/write access is fast. Be aware that anything saved in this partition will be gone after your computer is turned off.

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

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

Enable automatic typo correction for directory names


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