`sys` module

Process-level information: command-line arguments, environment variables, current directory, and a way to exit with a status code.

import "sys" as sys;

print("argv count:", sys.argc());
print("user:",       sys.env("USER"));
print("cwd:",        sys.cwd());

API

Function	Description
`sys.argc()` → number	Count of arguments passed to the script (not counting `bnl` itself or the script path).
`sys.arg(i)` → string	The i-th argument (0-indexed). Throws on out-of-range.
`sys.env(name)` → string \| null	Look up one environment variable.
`sys.envs()` → map	Snapshot of every environment variable as a `{KEY: value}` map.
`sys.cwd()` → string	The process's current working directory.
`sys.exit(code)`	Exit the process with the given status code.
`sys.platform`	`"windows"`, `"linux"`, or `"macos"`.