As per the zpool(8) man page:
> zpool list [-HgLpPv] [-o property[,property]...] [-T u|d] [pool]... [interval [count]]
> Lists the given pools along with a health status and space usage. If no pools are specified, all pools in the system are listed. When given an interval, the information is printed every
> interval seconds until ^C is pressed. If count is specified, the command exits after count reports are printed.
> [...]
> -p Display numbers in parsable (exact) values.
The following issues were fixed:
* comparison too broad (e.g. "0" misinterpreted as "true")
* python: comparing string with number (is never equal in python)
* unwanted non-zero exitcode (compound command "&&" as last command in
shell code block (e.g. "case" or "if" branch))
* access to unset variable (shell style issue)