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This can be written as..

Condition?True:FalseHere we are using var!=NF as condition.
If condition satisfies then execute true part. If condition fails then execute false part.

As var is not...

It's ok..

awk -v var="$1" # It uses var for saving $1(number which are passed to the script is $1).

'{ print var!="NF"?$var:$NF}' # Here we check if variable var is not equal to "NF". If...