You can blame Bill Joy for that. Allegedly, it was him who made csh the default root shell way back in the day. The reason it was never changed to sh or ksh sub

You can blame Bill Joy for that. Allegedly, it was him who made csh the default root shell way back in the day. The reason it was never changed to sh or ksh subsequently is simply that it was never that big a deal: tcsh is a solid interactive shell, it sucks for scripting.