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get all Amazon cloud (amazonws etc) ipv6 subnets

Determine next available UID
better with accounts on ldap

Prettify an XML file
Generated XML files often are poorly formatted. Use this command to properly indent and normalize the file in-place.

Regnerate Exif thumbnail.
Regnerate Exif thumbnail.

Recursive Ownership Change
Changing files ownership in a directory recursivley from a user to another

Remove old kernel packages

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

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

Monitor cpu in realtime.

convert vdi to vmdk (virtualbox hard disk conversion to vmware hard disk format)
Converts a .vdi file to a .vmdk file for use in a vmware virtual machine. The benefit: using this method actually works. There are others out there that claim to give you a working .vmdk by simply using the qemu-img command alone. Doing that only results in pain for you because the .vmdk file will be created with no errors, but it won't boot either. Be advised that these conversions are very disk-intensive by nature; you are probably dealing with disk images several gigabytes in size. Once finished, the process of using the new .vmdk file is left as an exercise to the reader.


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