The os module

What the operating system provides beyond the running process: environment variables, clocks and time, and the machine and user.

os is a module: bring it in with import os (and write os.environment("HOME")) or import names directly with import [Instant, Duration] from os.

• Environment: environment(name), environment_variables(), set_environment(name, value) and remove_environment(name)
• Time: Duration, Instant (a monotonic clock, for measuring) and SystemTime (the wall clock)
• Machine: system_os(), system_name(), system_version(), architecture(), hostname(), processor counts, total_memory(), page_size()
• User: user_name(), home_directory(), temp_directory(), is_elevated()

Example

import os;

main(): int {
    var start = os.Instant.now();
    var runtime = os.environment("PEPPER_RUNTIME").value_or("runtime");
    print($"runtime at {runtime} on {os.hostname()}");
    print($"took {os.Instant.now() - start}");
    return 0;
}

Source: runtime/os/module.pep