Thank you very much for this! It is now going into Linux Phrasebook, volume 2.
Scott
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R. Scott Granneman
sc...@granneman.com ~ www.granneman.com ~ granneman.tel
Full list of publications @ http://www.granneman.com/publications
My latest book: Mac OS X for Power Users @ http://www.granneman.com/books
“One of the differences between people who do science and people who don’t is
the people who do science realize that what you’re trying to do in science is
falsify a hypothesis. And only after you examine all sorts of evidence and you
can’t falsify a hypothesis do you establish that the hypothesis is true. The
people trying to prove a hypothesis look at any piece of positive evidence and
then stop.”
---Peter Rosen, emergency room doctor
Robert Citek wrote:
On Sun, Mar 17, 2013 at 10:00 AM, Carl Fitchc...@sluug.org wrote:
Very interesting! On my MAcBook there is not a --date parameter and -d is:
-d dst Set the kernel's value for daylight saving time. If dst is
non-zero, future calls to gettimeofday(2)
will return a non-zero for tz_dsttime.
My experience with --date was as a way to convert formats in bash scripts:
date +%F --date=05/12/1953
1953-05-12
Exactly. One use of the date command is to display various date/time
formats. By default, date uses the current system time and timezone.
But the --date= option enables date to use an alternate date/time
specified by STRING. What range of possible strings are valid is not
immediately obvious. It's as though the STRING section of the manual
was omitted.
Some examples:
# default, today, now -- all equivalent
date
date --date=now
date --date=today
# unix epoch
date --date=@0
date --date=@0 -u
# past, future
date --date=yesterday
date --date=tomorrow
date --date=next week
date --date=last week
# future day of week, Sunday-Saturday, abbreviations work. Midnight
local timezone.
date --date=sat
date --date=sat -u
# 1-2 digit number == today's hour (0-23), local timezone, unless specified
date --date=10
date --date=10 -R
date --date=10 -R -u
# 3-4 digit numbers == today's time
date --date=010
date --date=1010
# 5-?? digit numbers == a date; 6-digit dates are assumed to be 1900
or 2000 years
date --date=71010 -u
date --date=871010 -u
date --date=0871010 -u
date --date=9871010 -u
date --date=19871010 -u
What surprises me is that I have not found any of this information
described in the man pages. Instead, it is documented in the info
pages, but again somewhat cryptically and with few examples.
Regards,
- Robert
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