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File system operations, environment variables, and OS utilities. 
import os

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Functions

FunctionDescriptionExample
os.read(path)Read file contentsos.read("config.txt")
os.write(path, content)Write string to fileos.write("out.txt", "hello")
os.append(path, content)Append to fileos.append("log.txt", "entry\n")
os.exists(path)Check if file/dir existsos.exists("config.txt") → true
os.delete(path)Delete a fileos.delete("temp.txt")
os.mkdir(path)Create directoryos.mkdir("output")
os.list(path)List directory contentsos.list(".") → ["file1", "dir1"]
os.cwd()Current working directoryos.cwd() → "/home/alex/project"
os.env(key)Get environment variableos.env("HOME")

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Examples

import os

# Read and process a file
content = os.read("data.txt")
lines = content.split("\n")
print("Lines: {len(lines)}")

# Write results
os.write("output.txt", "Processed!")

# List files
files = os.list(".")
for f in files
    print(f)

# Check before read
if os.exists("config.json")
    config = os.read("config.json")

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Compile Flag

cargo build --release --no-default-features --features mod_os