I was looking that up and found that in UNIX v6 source code, the field name in kernel source code is u_cdir, which stands for "current directory of (user) proce

I was looking that up and found that in UNIX v6 source code, the field name in kernel source code is u_cdir, which stands for "current directory of (user) process": https://github.com/yisooan/unix-v6/blob/master/sys/user.h https://github.com/yisooan/unix-v6/blob/master/sys/user.h