On 08/24/08 11:32, Rick Pasotto wrote:
On Sun, Aug 24, 2008 at 11:25:31AM -0500, Ron Johnson wrote:
On 08/24/08 10:54, Edward J. Shornock wrote:
[snip]
While I'm sure someone else will provide a much better way, I've used
something like
$ echo $(date -d 20080824 +%j) - $(date -d 20080724 +%j) | bc
31
That a good idea. I never knew date(1) could do that. The problem,
though, is that it doesn't span years.
$ echo $(date -d 20090824 +%j) - $(date -d 20080724 +%j) | bc
30
Use delta from epoch, instead.
$ echo $[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)]/86400|bc
396
Why pipe it to bc? Keep it in the shell:
$ echo $[$[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)] / 86400]
396
I was thinking that integer division might result in the occasional
rounding error. But now that I think about it, that wouldn't
matter, since bc does integer math unless you pass it "-l".
One stylistic reason for piping to bc is that some people think that
bash's $[] syntax gets too hard to read if you nest it too much.
--
Ron Johnson, Jr.
Jefferson LA USA
"Do not bite at the bait of pleasure till you know there is no
hook beneath it." -- Thomas Jefferson
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