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install all archive file type apps in ubuntu

Calculating number of Connection to MySQL

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

Show sorted list of files with sizes more than 1MB in the current dir
no fancy grep stuff here.

List just the executable files (or directories) in current directory
With zsh.

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

copy ACL of one file to another using getfacl and setfacl

Connect to google talk through ssh by setting your IM client to use the localhost 5432 port
If your firewall or proxy at your location prevents connection to a particular host or port, you can use ssh to tunnel to your home server and do it there instead.

A DESTRUCTIVE command to render a drive unbootable
Overwrites the boot sector. Since this doesn't overwrite any data, you can usually recover by re-creating the partition table exactly the same as before you zeroed it. This can also help sometimes if you install a new drive in a Windows machine which can't read it.

Test for Weak SSL Ciphers
...if you get a certificate back, the server is accepting weak SSL ciphers


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