Someone

#!/bin/bash

echo "Log info" > gm.log
echo "" > temp1
echo "" > temp2
echo "" > temp3
echo "" > temp4
echo "" > temp5
echo "" > final.txt


while [ 1 ]; do
    cat temp5 >> final.txt
    mv temp4 temp5
    mv temp3 temp4
    mv temp2 temp3
    mv temp1 temp2
    mv gm.log temp1
    sleep 60
done