[#]TIL #Linux has a fourth timestamp field on files: `btime' or birth time or when the file was created. (As distinct from ctime, around in #Unix since the 1970s, which is when the i-node was last changed--file contents or metadata--even though some people still get confused and think c stands for create.)
Since it's beyond #POSIX, stat(2) doesn't return it; Linux-specific statx(2) does. stat(1) prints it.
Useful for forensic debugging, which is how I stumbled on it.
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