cat > temp001
5
10
12
6
9
12
5
awk 'p{print $0-p}{p=$0}' temp001
5
2
-6
3
3
-7
REF:
cat > temp001
5
10
12
6
9
12
5
awk 'p{print $0-p}{p=$0}' temp001
5
2
-6
3
3
-7
REF:
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