#!/usr/bin/env zsh
emulate -L zsh
setopt err_exit

typeset job="nightly backup"
typeset -i tries=3
log="${job}-${tries}.log"
export MODE=staging

print -r -- "job=$job"
print -r -- "tries=$tries"
print -r -- "log=$log"
zsh -fc 'print -r -- "child=$MODE"'
unset MODE
print -r -- "after=${MODE-unset}"