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I got it!

Thank you so much!

I come up with this one:
file='XX1.txt'
i=1
while [ $i -lt 366 ]
do
head -$i $file | tail -1 | cut -c1-5 > a.txt
grep "$i" a.txt
check2=$?
# echo $check2
if [ $check2 -eq 1 ]
...

Hi,

I have a data sample as shown below. I want to fill in the left column so that the line will be continuous. For example, between 1 and 5 should be 2,3,4. And corresponding values in the right...