os
Systemimport "os"Provides a platform-independent interface to operating system functionality like files, env vars, and processes.
Example
package main
import "os"
func main() {
data, _ := os.ReadFile("config.json")
os.Setenv("APP_ENV", "production")
os.Exit(0)
}Key Types & Functions
FileReadFileWriteFileMkdirGetenvArgsAbout os
The os package (imported as os) belongs to the System category of Go packages. Provides a platform-independent interface to operating system functionality like files, env vars, and processes.
Go's standard library is one of the language's greatest strengths, providing production-ready implementations for networking, cryptography, encoding, I/O, and more. The os package follows Go's philosophy of simplicity and composability — small, focused packages that combine through interfaces like io.Reader and io.Writer.
When using os in production, follow Go best practices: handle errors explicitly, use context for cancellation and timeouts, prefer composition over inheritance, and write table-driven tests. The Go documentation at pkg.go.dev provides comprehensive API references and examples for every exported type and function.