What is os in Golang ?

 os is a built-in package in Golang that provides a platform-independent interface to operating system functionality, including file I/O, environment variables, and process management.

Some of the functions and types provided by the os package include:

os.Args: a slice of strings representing the command-line arguments passed to the program

os.Stdin, os.Stdout, and os.Stderr: file objects representing standard input, standard output, and standard error, respectively

os.Open(): opens a file for reading

os.Create(): creates a file for writing

os.Getwd(): gets the current working directory

os.Chdir(): changes the current working directory

os.Getenv(): gets the value of an environment variable

os.Setenv(): sets the value of an environment variable

os.Exit(): exits the program with a given status code

The os package is very useful for working with files, directories, and environment variables in a platform-independent way, and for managing the lifecycle of a Golang program.