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Other shells, say zsh, ksh, csh, tcsh, and others, work just differently enough to merit their own summary (By someone who uses them. In general, you can need to consider the distinction what gets sourced by: file used by what?used when / notes ------------------ ------------------------ ---------------------------- /etc/profile sh family login shells at login /etc/profile.d/*sh family from a loop placed in /etc/profile other extensions in the directory are for other shells ~/.login sh family login shells at login ~/.profile sh family login shells at login ~/.logout sh family login shells at logout /etc/bashrc I've mostly seen this sourced explicitly or bash The point seems to be to put environment in /etc/profile, /etc/bash/bashrc functions and aliases in here.DNA tests on modern-day turtles suggest they may be related to crocodiles, according to Sulej.Adding to the intrigue, Procolophons are not thought to be related to crocs, he said. But the shells that have afforded turtles protection from predators for aeons are no match for humans.To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies.If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies.These most ancient of creatures are thought to have evolved from Procolophons, a type of parareptile living in the Permian period up to 300 million years ago.The Odontochelys semitestace, a 2008 find in China dating back 220 million years has also been classed by experts as a turtle ancestor, which like them had a belly shell, but unlike them had teeth and no full top shell.
Now, Sulej says his mission is to find a turtle skull.
Though fossils carry no organic material for DNA testing, their structures hold precious clues to the origins of species.
"Each new turtle fossil is invaluable as it could provide clues to their origin, which up to now has been a bit of a mystery," he said.
A fossil of one of the world's oldest-known turtle shells with a limb bone dating from 215 million years ago, discovered in clay deposit northwest of Krakow, is examined at the Institute of Paleobiology of the Polish Academy of Sciences in Warsaw.
Dating back 215 million years, experts say they could provide invaluable clues in solving the riddle of the origin of this ancient reptile, venerated by cultures across the globe. There are around eight spots on Earth where you might find them, and here in Poland we've unearthed the oldest and most extensive collection," said Tomasz Sulej, a paleobiologist with the Polish Academy of Sciences (PAN) who made the discovery in a region known as the Polish Jurassic Highland.
Sulej's discovery came on the heels of a new 200 million-year-old dinosaur species unearthed in nearby Lisowice in 2006-7.