Salam Alaikum Wr Wb

I have a brain teaser of the shell utilities type for you guys. :)

A file foo.txt has a list of date strings in this format:

8/31/2011
1/7/2020
1/31/2013
11/4/2010

and so one.

How would one go about flipping them  into yyyy/mm/dd format in bar.txt?

as in :

2011/08/31
2020/01/07
2013/01/31
2010/11/04

Notice the single digit month or day must become 2 digits. From 8 to 08


"compute regular expressions in his mind at the speed of lighting"  Huh!


:D

Wasslam Alaikum wr wb

Abdallah


ps.  The speed of light = 299 792 458 m / s   So how many meters do you need?

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