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As in the Perl example, just use integer arithmetic and you'll be fine. Separate dollars from cents at the end of your script.

If this is intended to be arbitrarily accurate, you should use bc. awk uses floating point numbers and may lose a penny here and there.

all the choices you mention will work.


awk '
{
val=$0 + 0
sum=sum+val
}
END {
l=length(sum)
if (l > 2)
printf("$%s.%s\n",substr(sum,1,(l-2)),substr(sum,(l-1)))
else
...

Yes, lots of ways to do this. One example in Perl (not using error checking to keep it simple):

open(IN, "<my_file.txt");
while($in = <IN>)
{
$sum += $in;
}
$sum =~ /(\d+?)(\d\d)$/;...