- Add var_continue_on_error=yes to skip failed containers instead
of aborting all remaining updates. Useful for cron/unattended runs
where one disabled or broken script should not stop others.
Containers with backup still attempt restore on failure regardless.
- Set TERM=dumb when running pct exec to prevent whiptail from
hanging when no TTY is available (e.g. cron jobs redirecting
stdout/stderr). This causes whiptail to fail-fast instead of
blocking indefinitely.
- Add var_continue_on_error to export_config_json, --help output,
and usage examples (cron-style invocation example added).
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