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Using dconv from dateutils (http://www.fresse.org/dateutils/):

dconv -i '%Y%D' 2013159
=> 2013-06-08

Ah I see. No, what happens is dconv with no output format specifiers will return ISO 8601 dates (aka 2012-10-31T17:44:00) which are sortable just like that, UNLESS of course you go before the year...

I mean that dconv is actually made to parse and operate on dates, sort is not.



True.



You guessed wrong. And I'm curious as to what 3 characters you meant? Also, dconv doesn't depend...

With a slight overhead (about double run time) you could use dateutils (http://hroptatyr.github.com/dateutils/) dconv tool to normalise the data, sort them, and convert them back:

dconv -i...

Or use dateutils (http://hroptatyr.github.com/dateutils/), e.g.

dconv yesterday -f '%Y/%b/%d'

Using dateutils (http://hroptatyr.github.com/dateutils/) this would be:

dadd today -8mo
=>
2011-12-31

If a little extra tool is fine have a look at dateutils (http://hroptatyr.github.com/dateutils/). What you want:

dconv 2012-08-03-05 -f '%Y-%m-%d'
=>
2012-08-17

which makes use of a...

If it's feasible for you to use an external helper tool, check out my dateutils (http://hroptatyr.github.com/dateutils) (http://hroptatyr.github.com/dateutils).

ddiff -i '%Y%m%d|%H%M%S'...

date -d '20120404' +%W

That's not possible, I'm afraid, you can use /usr/bin/env as shebang to find the user's preferred command, or rather, the command in the user's environment. But you can't "change" the shebang...

How about?

sed 's/ 0\.0/*/g'