Both you and dk win.

echo "$SHELL $COMMAND_MODE"
/bin/tcsh unix2003

The only clean install that I did in OS X was Jag. All others have been via Upgrade.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365