Unexpected Filename Expansion in AWK Command Affects * Operator Usage

When I run the following `awk` command:

```bash
awk -v NCHARS=$nchars 'BEGIN {
OFMT = "%.2g%%"}
{print $1, $2, $1 / NCHARS * 100}' "res1"
```

The `*` character seems to get expanded, even though it's part of the `awk` code. Instead of treating the `*` as a multiplication operator, it expands to the list of filenames in the directory as follows:

```bash
awk -v NCHARS="4862992" 'BEGIN { OFMT = "%.2g%%"} {print $1, $2, $1 / NCHARS deps docs LICENSE log.log model-checking parallel-orch pash-spec.sh README.md report res1 res1.txt res2.txt Rikerfile scripts test 100}' "res1"
```

This issue will likely impact other commands that use the `*` operator, potentially causing filename expansions where they are not intended.