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I have several csv files like this:
file1.csv
1 12 1
2 8 9
3 9 2
4 5 9
...
file2.csv
1 0 1
2 2 3
3 4 1
...
file3.csv
1 0 1
2 4 ...

#! /bin/sh

awk '
BEGIN {
delta=0.2

# process first line
getline
value=$2
print
}
{
if ( $2-value > delta ) {
print
value=$2
}
}' input

May work for you:


find ~/modeling* -name "*.log"|xargs -ix bash -c "tac x|grep -m 3 -e ITER"

Try: awk 'NR>5&&NR<9{$2+=0.1}1' file

de=$(echo "$scale;($e2)-($e1)" | bc -l)

I would do something like this:
awk 'NR==FNR {
for(i=1;i<=NF;i++)A[NR,i]=$i
next
}
{
for(i=1;i<=NF;i++){
t=0
for(j=1;j<=NF;j++)
...