Calculate difference between consecutive data points in a column from a file
cat > temp001
5
10
12
6
9
12
5
awk 'p{print $0-p}{p=$0}' temp001
5
2
-6
3
3
-7
REF:
https://www.unix.com/shell-programming-and-scripting/130727-how-subtract-adjacent-lines-single-column.html
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