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-k -1 for last field?

From: Karl Berry
Subject: -k -1 for last field?
Date: Mon, 30 May 2022 11:43:41 -0600

How about supporting negative POS values for -k to count from the last
field? Useful when there are a varying number of fields. Crazy?

E.g., two-line file
desired to sort on last field via:
  sort -t/ -k -1,-1 

Clearly there are ways to achieve the goal, e.g., extract and duplicate
the last field to the beginning, or use Perl/awk/whatever to do the
sorting, but ... just thought I'd throw it out there ... -k

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