[COFF] Source for a vaguely Bourne-like shell, no signals

Hi all, this is a pretty weird question to ask. I've been extending the RISC-V version of xv6 to have a decent libc and some userland programs: https://github.com/DoctorWkt/xv6-riscv-fuzix There's a minimalist shell and my own 'wish' shell; neither have any scripting capability. Also, as it stands there are no signals implemented. I'd love a Bourne-ish shell to write shell scripts, but I've had a hard time finding one that I can snip out the signal handling code. If you have any suggestions, please met me know! Thanks, Warren