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Create a tar archive using xz compression
Compress files or a directory to xz format. XZ has superior and faster compression than bzip2 in most cases. XZ is superior to 7zip format because it can save file permissions and other metadata data.

Format partition with ext4 but without a journal
For slow flash memory (cheap thumb drive), ext4 is the fastest stable file system for all use cases with no relevant exception: http://www.linuxplanet.com/linuxplanet/tutorials/7208/1 Since we can usually dispense with the benefits of a journal for this type of storage, this is a way to achieve the least awful I/O-speed. Disabling the journal for an existing ext4 partition can be achieved using $ tune2fs -O ^has_journal /dev/sdXN Note that it is often recommended to format removable flash media with ext2, due to the lack of a journal. ext4 has many advantages over ext2 even without the journal, with much better speed as one of the consequences. So the only usecase for ext2 would be compatibility with very old software.

list block devices
Shows all block devices in a tree with descruptions of what they are.

floating point operations in shell scripts
allows you to use floating point operations in shell scripts

Protect against buffer overflow
This command solve the problem ping: sendmsg: No buffer space available to.

Creating A Single Image Video With Audio via ffmpeg

hibernate

diff two sorted files
Sees if two records differ in their entries, irrespective of order.

Get the current gold price
Returns the current price of a troy ounce of gold, in USD. Requires the "jq" JSON parser.

List available upgrades from apt without upgrading the system


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