long number most significant bit chopped off in shell script -


i assigning long value variable in shell script , trying calculations it, results negative sign numbers. 

    count=4     initial_value=128     final_value=18446744073709547520     step=$((($final_value - $initial_value) / ($count - 1)))     value=$initial_value     for((i=1; i<=count; i++))         start=`date +%s`     myvariable=$(mysql $database -u $user -se "set global join_buffer_size = $value;query run")     end=`date +%s`     time=`echo "$end - $start" | bc`     echo "$value $time" >> output.txt     value=$(($value+$step))     mysqld restart     done

the output of output.txt file this:

    128 20     -1280 20     -2688 21     -4096 20

i can't tell shell script use unsigned long, didn't chop off number. how can fix it? thanks

your $final_value larger max int bash arithmetic (which 9223372036854775807). use bc instead:

count=4 initial_value=128 final_value=18446744073709547520 step=$(echo "($final_value - $initial_value) / ($count - 1)") value=$initial_value for((i=1; i<=count; i++)) start=$(date +%s) myvariable=$(mysql $database -u $user -se "set global join_buffer_size = $value;query run") end=$(date +%s) time=$(echo "$end - $start" | bc) echo "$value $time" >> output.txt value=$(echo "$value+$step" | bc) mysqld restart done

sample output (removed mysql commands copy):

128 0 6148914691236515925 0 12297829382473031722 0 18446744073709547519 0

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