Tests passing locally:
bash (no)daemon C
busybox (no)daemon C
fish (no)daemon C
mksh (no)daemon C
rc (no)daemon C
tcsh (no)daemon C
zsh (no)daemon C
zsh zpython
ipython
pdf module
pdf subclass
dash has problems with job control (bgscript.sh not finished by kill)
socat may close pipe before they succeed to write something which results in
env: write error: Broken pipe
(according to my experience leading printf’s always succeeds to write before
socat closes pipe).