I had recently observed many .z.* files in my home. I tracked this down to the env command used by z.sh. I aliased it to env | sort. In this case, the temporary files are not removed correctly.
As I'm not the only one with the problem, I suggest to use /usr/bin/env in z.sh.
The problem was also reported on stackexchange
I had recently observed many .z.* files in my home. I tracked this down to the
envcommand used by z.sh. I aliased it toenv | sort. In this case, the temporary files are not removed correctly. As I'm not the only one with the problem, I suggest to use/usr/bin/envin z.sh. The problem was also reported on stackexchange