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in awk,
{
if NR % 2 == 0
print $1-ODD
else
ODD=$1
}

Please try.

OK

Please use code tags. Video tutorial on how to use them...

#! bin/bash
echo "Enter desired file"
read "$file"
if [ ! -f $file ] ; then
touch $file #this will create the file
fi
vi $file

Please use code tags