copy code from `rehashfiles.js` (e.g. to lib or directly) for use in str_cmds.js, e.g.
```
;hash [filespec]
```
--- SBBSecho 3.23-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)
Who's Online
Recent Visitors
Flainn
Sun Dec 7 09:29:24 2025
from
Los Alamos N.M.
via
Telnet
Larwin
Sun Dec 7 06:51:26 2025
from
Salem, Oregon
via
Telnet
Larwin
Sun Dec 7 03:06:11 2025
from
Salem, Oregon
via
Telnet