sparklines in your terminal window. Simply give it a comma or space-separated list of data values, and it'll generate an ANSI-graphics sparkline chart. Brilliant! (via mjd)

a very hairy hack to perform a block-level rsync-like "send just the changes" algorithm between two very large files (think /dev/sda block devices).  Crazy, but it'd work alright!

a nifty gdb hack; essentially dup()s a couple of files in /tmp in place of fd 1 and 2, then uses the bashism "detach" to nohup the running process

another concurrency shell command; interesting approach to dashboarding the results, with the "mdm.screen" utility provided

by Ole Tange. pretty extensive, if inscrutable (via Tony Finch)

interesting idea; extend "cd" to track which directories you cd to most frequently, then add a command to "jump" to the most-frequently used one which matches a substring you specify

not quite up to par with modern Ubuntu, but still a few interesting ones here for when I'm stuck using the missus' laptop ;)

'A parallel implementation of gzip for modern multi-processor, multi-core machines', by Mark Adler, no less