I have read Trying to sort on two fields, second then first. I am still confused.
man sort page:
KEYDEF is F[.C][OPTS][,F[.C][OPTS]] for start and stop position
Why there are two
Does it mean you can write
OPTS at any place? Or do the two
OPTS affect different fields?
But isn't the key (e.g.
-k3,5) function as a whole?
What will happen if the two
OPTS are opposite? Such as:
sort -t " " -k3n,5nr filename
The other question is that
-k3n,5nr contains two white-spaces, how can the shell translate that into a number?
When we want to compare multi fields, should we use multi