Tagged Questions
2
votes
1answer
2k views
chmod: What does the `+a` parameter mean?
I was following a tutorial and it told me to run
sudo chmod +a "SOME_PARAMS" some/dir
I was surprised to see that fail telling me
chmod: invalid mode: `+a'
So I wonder: What does the +a mode ...
4
votes
1answer
444 views
Printing the current date/time with sub-second precision
GNU date(1) understands the %N format spec, which outputs nanoseconds, so:
$ date +%H:%M:%S.%N
outputs 19:10:03.725196000
BSD date doesn't understand %N. How can I print the current time with ...
14
votes
2answers
3k views
Where does Mac OS X come from?
Discussing with Mac owners, I got several versions of where Mac OS X comes from. It is known to have some root in BSD, but how much, and where?
Some say that Mac OS X has a FreeBSD kernel, with all ...
